Psyc Personality, Chapter 2

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Questions and Answers

If two researchers are coding data on a personality trait and their coding agreement yields a Cohen's Kappa value of 0.75, what can we conclude about their inter-rater reliability?

  • The researchers have a perfect level of agreement, indicating no discrepancies in their coding.
  • The researchers have a moderate level of agreement, suggesting some consistency in their coding but room for improvement.
  • The researchers have a low level of agreement, indicating significant inconsistencies in their coding.
  • The researchers have a high level of agreement, indicating a strong consistency in their coding. (correct)

A researcher conducts a study on the relationship between stress levels and academic performance. They find a statistically significant correlation with a p-value of 0.03. What does this finding tell us about the results?

  • The correlation is statistically significant, indicating a weak relationship between stress levels and academic performance. (correct)
  • The correlation is statistically significant, indicating a strong relationship between stress levels and academic performance.
  • The correlation is statistically significant, suggesting that stress levels likely cause changes in academic performance.
  • The correlation is not statistically significant, meaning there is no relationship between stress levels and academic performance.

In a sample of 20 participants, the ages are: 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, and 37. What is the mean of this distribution?

  • 28.5
  • 29.5
  • 30.5
  • 27.5 (correct)

In a dataset with an even number of values, how is the median calculated?

<p>The median is the average of the two middle values. (C)</p> Signup and view all the answers

Which of the following is NOT a benefit of using open data and open materials in research?

<p>Guarantees that all research findings are accurate and reliable. (C)</p> Signup and view all the answers

A study uses pre-registration to document its design and analysis plan before data collection. What is the primary benefit of this approach?

<p>It reduces the risk of bias in data analysis by preventing researchers from changing their hypotheses after seeing the results. (A)</p> Signup and view all the answers

A researcher wants to study the effectiveness of a new therapy for anxiety. They randomly assign participants to either the new therapy group or a control group that receives standard therapy. What type of study design is this?

<p>Experimental study (C)</p> Signup and view all the answers

What is the primary goal of a correlational study?

<p>To examine the relationship between two or more variables. (C)</p> Signup and view all the answers

A researcher wants to assess the reliability of a personality test. They administer the test to a group of participants twice, with a two-week interval between the administrations. What type of reliability are they measuring?

<p>Test-retest reliability (B)</p> Signup and view all the answers

Which of the following is NOT a characteristic of a good measure in psychological research?

<p>Subjectivity and bias in interpretation (A)</p> Signup and view all the answers

Which statistical measure is primarily used to assess the agreement between two independent coders?

<p>Cohen's Kappa (C)</p> Signup and view all the answers

Which p-value indicates a statistically significant result in most studies?

<p>0.01 (A), 0.001 (C), 0.05 (D)</p> Signup and view all the answers

Which term describes the middle value when a data set is ordered from least to greatest?

<p>Median (A)</p> Signup and view all the answers

What does a correlation coefficient (r) value of -0.4 indicate?

<p>Moderate negative correlation (B)</p> Signup and view all the answers

What is the appropriate statistical range for Cronbach’s Alpha to indicate a reliable scale?

<p>0.6–0.7 (C)</p> Signup and view all the answers

What does a p-value of 0.10 typically suggest about the results of a hypothesis test?

<p>Weak evidence against the null hypothesis (B)</p> Signup and view all the answers

Which statement accurately describes the significance of a p-value of 0.03?

<p>The results are statistically significant. (C), The results are not significant at the p &lt; 0.01 level. (D)</p> Signup and view all the answers

If a correlation coefficient is r = 0.25, what type of strength does this represent?

<p>Weak correlation (C)</p> Signup and view all the answers

Which measure represents the value that occurs most frequently in a data set?

<p>Mode (C)</p> Signup and view all the answers

In a normally distributed data set, how do the mean, median, and mode relate to one another?

<p>Mean = Median = Mode (A)</p> Signup and view all the answers

In what scenario would a strong correlation (e.g., r = 0.7) not be considered statistically significant?

<p>When p-value is greater than 0.05. (C)</p> Signup and view all the answers

Which of the following describes a zero correlation?

<p>There is no predictable relationship between two variables. (B)</p> Signup and view all the answers

What does Cronbach’s Alpha value greater than 0.9 indicate?

<p>Too high, indicating narrowness (C)</p> Signup and view all the answers

What does one asterisk (*) signify in statistical significance?

<p>p &lt; 0.05 (B)</p> Signup and view all the answers

What is the correct interpretation of a Cohen's Kappa value of 0.4?

<p>Moderate agreement (A)</p> Signup and view all the answers

How is a self-report questionnaire primarily structured?

<p>By relying on individual self-assessments. (B)</p> Signup and view all the answers

What level of significance does three asterisks (***) indicate?

<p>p &lt; 0.001 (C)</p> Signup and view all the answers

Which of the following best describes a condition where a correlation is statistically significant?

<p>There is less than a 5% chance the results are due to chance. (C)</p> Signup and view all the answers

What is the primary purpose of using the correlation coefficient?

<p>To measure the strength and direction of a relationship between two variables. (D)</p> Signup and view all the answers

A Cohen's Kappa value of 0.52 suggests which level of agreement between raters?

<p>Moderate agreement (C)</p> Signup and view all the answers

In a dataset, a particular score appears more frequently than any other. Which measure of central tendency does this score represent?

<p>Mode (A)</p> Signup and view all the answers

Which statement best describes the interpretation of a p-value of 0.06?

<p>The results are not statistically significant at the conventional level of 0.05. (B)</p> Signup and view all the answers

In a dataset where the values are 12, 15, 18, 20, 22, 25, 28, what is the median value?

<p>20 (D)</p> Signup and view all the answers

What does a Cronbach's Alpha value of 0.9 or greater suggest about a measurement scale?

<p>The items on the scale are measuring very narrow and potentially redundant aspects of a trait. (A)</p> Signup and view all the answers

If a correlation study has a correlation coefficient (r) of 0.7, but a p-value of 0.10, what is the most accurate interpretation?

<p>There is a strong positive relationship between the two variables which may be due to chance. (C)</p> Signup and view all the answers

What does a p-value of 0.02 indicate regarding the likelihood of the results being due to random chance?

<p>There is a 2% chance the results are due to chance. (B)</p> Signup and view all the answers

In a self-report questionnaire with a Likert scale ranging from 1 to 5 (1 = Strongly Disagree, 5 = Strongly Agree), which is the best statement that measures cat preference?

<p>I really like cats. (B)</p> Signup and view all the answers

What is the interpretation of a correlation coefficient (r) of -0.8?

<p>There is a strong inverse relationship between the variables. (A)</p> Signup and view all the answers

What is indicated by three asterisks (***) in a table reporting statistical significance?

<p>The results are very highly significant with a p &lt; 0.001. (A)</p> Signup and view all the answers

Flashcards

Self-Report Questionnaire

A questionnaire where individuals provide information about themselves.

Social Desirability Bias

Participants might answer in a way that makes them look good, even if it's not true.

Acquiescence Response Set

Tendency to agree with almost everything on a questionnaire.

Reverse-Scored Items

Questions phrased in an opposite direction to help detect response biases.

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Informant Reports

Using someone else's observations to assess a person's traits, instead of their own reports.

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Clinical Interview

A structured conversation with a participant to gather detailed information about their experiences, traits, or behaviors.

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Behavioral Measurements

Observing someone's actions, either by recording them or asking them to self-report.

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Archival/Life Outcomes Data

Data collected from historical records, such as school or medical records.

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Projective Tests

Tests with ambiguous stimuli designed to reveal hidden motives or unconscious thoughts.

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Physiological Measures

Measurements of bodily responses, like brain activity, hormone levels, or heart rate.

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Cohen's Kappa

A statistical measure of inter-rater reliability. It represents the agreement between two raters on a categorical judgment, considering the possibility of random agreement.

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Validity

The extent to which a scale or test actually measures the intended construct.

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Face Validity

A type of validity that assesses whether a measure appears to measure the intended construct. For example, a test of anxiety should include questions that seem related to anxiety.

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Predictive Validity

A type of validity that assesses whether a measure predicts relevant outcomes. For example, a test of conscientiousness should predict academic performance.

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Convergent Validity

A type of validity that assesses whether a measure correlates with other measures of the same construct. For example, two different tests of extraversion should be positively correlated.

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Discriminant Validity

A type of validity that assesses whether a measure does not correlate with unrelated constructs. For example, a test of extraversion should not be correlated with measures of intelligence.

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Triangulation

A research method that combines multiple methods to measure personality. It is used to ensure convergent validity by correlating results across different measures.

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Correlational Study

A type of research design examining relationships between variables. Limitations include an inability to establish causation and susceptibility to confounding variables.

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Experimental Study

A type of research design that identifies cause-and-effect relationships. Key features include random assignment, independent, and dependent variables.

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Mean

The average of all data points in a dataset.

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Correlation

A statistical measure that describes the strength and direction of the relationship between two variables. It ranges from -1.00 to +1.00, with positive values indicating a positive relationship, negative values indicating a negative relationship, and 0 indicating no relationship.

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Strength of Correlation

Represents the strength of a correlation. It can be weak (0 to ±0.3), moderate (±0.3 to ±0.6), or strong (±0.6 to ±1.0).

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P-value

A statistical value that indicates whether a correlation is likely due to chance or a real relationship between variables.

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Statistically Significant Correlation (P-value < 0.05)

A p-value less than 0.05 suggests that the correlation is statistically significant, meaning it is unlikely to have occurred due to chance.

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Highly Significant Correlation (P-value < 0.01)

A p-value less than 0.01 suggests a very high level of statistical significance, further minimizing the possibility of the correlation occurring due to chance.

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Very Highly Significant Correlation (P-value < 0.001)

A p-value less than 0.001 indicates a very highly significant correlation, suggesting a very strong and unlikely to be random association between variables.

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Not Significant Correlation (P-value > 0.05)

A p-value greater than 0.05 suggests the correlation is not statistically significant, meaning the observed relationship could be due to random variability.

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Likert Scale

A type of self-report questionnaire where participants rate their agreement with statements on a numerical scale, typically ranging from 1 (strongly disagree) to 5 (strongly agree).

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Observational Research

Research that relies on observing and recording data in natural settings, without manipulating variables. It can be used to understand real-world behavior and relationships between variables.

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Positive Correlation

One variable increases as the other increases.

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Negative Correlation

One variable increases as the other decreases.

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Zero Correlation

There's no relationship between the two variables.

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Statistically Significant Correlation

A correlation that is unlikely to have occurred by chance, with a P-value less than 0.05 indicating a statistically significant relationship.

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Study Notes

Correlation and Relationships

  • A correlation measures the strength and direction of a relationship between two variables.
  • The correlation coefficient (r) ranges from -1.00 to +1.00.
  • Positive correlation (+): As one variable increases, the other tends to increase. Example: Hours studied and test scores (r = +0.8).
  • Negative correlation (-): As one variable increases, the other tends to decrease. Example: Stress levels and quality of sleep (r = -0.6).
  • Zero correlation (0): No relationship exists between the variables. Example: Shoe size and intelligence (r = 0).
  • Strength of Correlations:
    • Weak: 0 to ±0.3
    • Moderate: ±0.3 to ±0.6
    • Strong: ±0.6 to ±1.0

P-Value

  • The p-value indicates statistical significance.
  • p < 0.05: Statistically significant; less than a 5% chance the results are due to random chance.
  • p < 0.01: Highly significant; less than a 1% chance the results are due to random chance.
  • p < 0.001: Very highly significant; less than 0.1% chance the results are due to random chance
  • p > 0.05: Not significant; results may be due to random variability.
  • Combining correlation and p-value: A weak correlation can still be significant if the p-value is low (e.g., r = 0.12 and p < 0.05). Conversely, a strong correlation may not be significant if the p-value is high (e.g., r = 0.8 and p > 0.05) due to a small sample size or high variability.

Statistical Significance Notation

  • Asterisks (***, **, *) indicate levels of statistical significance.
    • One asterisk (*): p < 0.05 (significant)
    • Two asterisks (**): p < 0.01 (highly significant)
    • Three asterisks (***): p < 0.001 (very highly significant)

Self-Report Questionnaires

  • A common method to measure personality.
  • Participants rate statements (e.g., on a Likert scale, True/False).
  • Benefits: Easy administration, convenient, efficient, simple scoring, random sampling.
  • Drawbacks: Social desirability bias, acquiescence response set, reverse-scored items can confuse participants.

Alternative Measurement Methods

  • Informant Reports: Data from others, e.g., teachers, spouses.
  • Clinical Interviews: Structured or semi-structured interviews, useful for extreme traits (e.g., ADHD, extreme personality characteristics).
  • Behavioral Measurements: Observing actions.
  • Archival/Life Outcomes Data: Data from records (school, medical, etc.).
  • Projective Tests: Using ambiguous stimuli to uncover underlying motives.
  • Physiological Measures: Bodily responses (e.g., fMRI, hormone levels, heart rate, cortisol).

Evaluating Personality Scales

  • Reliability: Consistency of the measure.
    • Internal reliability: Consistency of items measuring the same concept (Cronbach's alpha, 0.6–0.7 ideal, higher values often mean possible issues with scale items).
    • Test-retest reliability: Similar results over time (Pearson's correlation coefficient).
    • Inter-coder reliability: Agreement between independent coders (Cohen's Kappa).
  • Validity: Accuracy of the measure, does it measure what it is supposed to.
    • Face validity: Does the scale appear to measure the intended concept?
    • Predictive validity: Predicts relevant outcomes (e.g., conscientiousness predicts academic performance).
    • Convergent validity: Correlates with other measures of the same concept.
    • Discriminant validity: Does not correlate with unrelated constructs.

Study Design

  • Correlational studies: Examine relationships between variables but cannot establish cause-and-effect.
  • Experimental studies: Identify cause-and-effect relationships, using random assignment and independent and dependent variables.

Descriptive Statistics

  • Mean: The average of all data points.
  • Median: The middle value in a data set.
  • Mode: The most frequent value in a data set.

Additional Notes

  • Formatting: Participants typically rate statements using scales (e.g., Likert scales, True/False).
  • Self-report questionnaires: Example formats include Likert scales (strongly disagree to strongly agree) or true/false.
  • Combining Measures: Combining multiple methods (triangulation) enhances confidence in findings. Combining multiple measures and methods strengthens confidence in results (triangulation).

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