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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?
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?
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?
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?
In a dataset with an even number of values, how is the median calculated?
Which of the following is NOT a benefit of using open data and open materials in research?
Which of the following is NOT a benefit of using open data and open materials in research?
A study uses pre-registration to document its design and analysis plan before data collection. What is the primary benefit of this approach?
A study uses pre-registration to document its design and analysis plan before data collection. What is the primary benefit of this approach?
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?
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?
What is the primary goal of a correlational study?
What is the primary goal of a correlational study?
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?
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?
Which of the following is NOT a characteristic of a good measure in psychological research?
Which of the following is NOT a characteristic of a good measure in psychological research?
Which statistical measure is primarily used to assess the agreement between two independent coders?
Which statistical measure is primarily used to assess the agreement between two independent coders?
Which p-value indicates a statistically significant result in most studies?
Which p-value indicates a statistically significant result in most studies?
Which term describes the middle value when a data set is ordered from least to greatest?
Which term describes the middle value when a data set is ordered from least to greatest?
What does a correlation coefficient (r) value of -0.4 indicate?
What does a correlation coefficient (r) value of -0.4 indicate?
What is the appropriate statistical range for Cronbach’s Alpha to indicate a reliable scale?
What is the appropriate statistical range for Cronbach’s Alpha to indicate a reliable scale?
What does a p-value of 0.10 typically suggest about the results of a hypothesis test?
What does a p-value of 0.10 typically suggest about the results of a hypothesis test?
Which statement accurately describes the significance of a p-value of 0.03?
Which statement accurately describes the significance of a p-value of 0.03?
If a correlation coefficient is r = 0.25, what type of strength does this represent?
If a correlation coefficient is r = 0.25, what type of strength does this represent?
Which measure represents the value that occurs most frequently in a data set?
Which measure represents the value that occurs most frequently in a data set?
In a normally distributed data set, how do the mean, median, and mode relate to one another?
In a normally distributed data set, how do the mean, median, and mode relate to one another?
In what scenario would a strong correlation (e.g., r = 0.7) not be considered statistically significant?
In what scenario would a strong correlation (e.g., r = 0.7) not be considered statistically significant?
Which of the following describes a zero correlation?
Which of the following describes a zero correlation?
What does Cronbach’s Alpha value greater than 0.9 indicate?
What does Cronbach’s Alpha value greater than 0.9 indicate?
What does one asterisk (*) signify in statistical significance?
What does one asterisk (*) signify in statistical significance?
What is the correct interpretation of a Cohen's Kappa value of 0.4?
What is the correct interpretation of a Cohen's Kappa value of 0.4?
How is a self-report questionnaire primarily structured?
How is a self-report questionnaire primarily structured?
What level of significance does three asterisks (***) indicate?
What level of significance does three asterisks (***) indicate?
Which of the following best describes a condition where a correlation is statistically significant?
Which of the following best describes a condition where a correlation is statistically significant?
What is the primary purpose of using the correlation coefficient?
What is the primary purpose of using the correlation coefficient?
A Cohen's Kappa value of 0.52 suggests which level of agreement between raters?
A Cohen's Kappa value of 0.52 suggests which level of agreement between raters?
In a dataset, a particular score appears more frequently than any other. Which measure of central tendency does this score represent?
In a dataset, a particular score appears more frequently than any other. Which measure of central tendency does this score represent?
Which statement best describes the interpretation of a p-value of 0.06?
Which statement best describes the interpretation of a p-value of 0.06?
In a dataset where the values are 12, 15, 18, 20, 22, 25, 28, what is the median value?
In a dataset where the values are 12, 15, 18, 20, 22, 25, 28, what is the median value?
What does a Cronbach's Alpha value of 0.9 or greater suggest about a measurement scale?
What does a Cronbach's Alpha value of 0.9 or greater suggest about a measurement scale?
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?
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?
What does a p-value of 0.02 indicate regarding the likelihood of the results being due to random chance?
What does a p-value of 0.02 indicate regarding the likelihood of the results being due to random chance?
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?
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?
What is the interpretation of a correlation coefficient (r) of -0.8?
What is the interpretation of a correlation coefficient (r) of -0.8?
What is indicated by three asterisks (***) in a table reporting statistical significance?
What is indicated by three asterisks (***) in a table reporting statistical significance?
Flashcards
Self-Report Questionnaire
Self-Report Questionnaire
A questionnaire where individuals provide information about themselves.
Social Desirability Bias
Social Desirability Bias
Participants might answer in a way that makes them look good, even if it's not true.
Acquiescence Response Set
Acquiescence Response Set
Tendency to agree with almost everything on a questionnaire.
Reverse-Scored Items
Reverse-Scored Items
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Informant Reports
Informant Reports
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Clinical Interview
Clinical Interview
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Behavioral Measurements
Behavioral Measurements
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Archival/Life Outcomes Data
Archival/Life Outcomes Data
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Projective Tests
Projective Tests
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Physiological Measures
Physiological Measures
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Cohen's Kappa
Cohen's Kappa
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Validity
Validity
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Face Validity
Face Validity
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Predictive Validity
Predictive Validity
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Convergent Validity
Convergent Validity
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Discriminant Validity
Discriminant Validity
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Triangulation
Triangulation
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Correlational Study
Correlational Study
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Experimental Study
Experimental Study
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Mean
Mean
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Correlation
Correlation
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Strength of Correlation
Strength of Correlation
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P-value
P-value
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Statistically Significant Correlation (P-value < 0.05)
Statistically Significant Correlation (P-value < 0.05)
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Highly Significant Correlation (P-value < 0.01)
Highly Significant Correlation (P-value < 0.01)
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Very Highly Significant Correlation (P-value < 0.001)
Very Highly Significant Correlation (P-value < 0.001)
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Not Significant Correlation (P-value > 0.05)
Not Significant Correlation (P-value > 0.05)
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Likert Scale
Likert Scale
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Observational Research
Observational Research
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Positive Correlation
Positive Correlation
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Negative Correlation
Negative Correlation
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Zero Correlation
Zero Correlation
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Statistically Significant Correlation
Statistically Significant Correlation
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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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