Statistics Quiz

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Questions and Answers

Which of the following is true of the Pearson correlation coefficient?

  • c) It is legitimately used only when the relations between variables are linear. (correct)
  • b) It can have values ranging from -2 to 2.
  • d) It is unaffected by outliers.
  • a) It is used primarily for non-linear relationships.

Typically, adding items to a test will have what effect on the test’s reliability?

  • a) Reliability will decrease.
  • b) Reliability will remain the same.
  • c) The number of items has no impact on reliability.
  • d) Reliability will increase. (correct)

Which of the following is true for parallel forms of a test?

  • a) Only the means are equal for the two forms.
  • c) Neither means nor variances are equal for the two forms.
  • b) Only the variances are equal for the two forms.
  • d) Both means and variances are equal for the two forms. (correct)

Which of the following is NOT a type of validity?

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

Which of the following is an example of a false positive?

<p>A test identifies a client as schizophrenic when the client is not. (B)</p> Signup and view all the answers

Which type of reliability estimate is obtained by correlating pairs of scores from the same person on two different administrations of the same test?

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

Which of the following is NOT a part of the formula for the standard error of measurement for a particular test?

<p>Validity of the test (C)</p> Signup and view all the answers

Which of the following best describes a "good" test item?

<p>It distinguishes high scorers from low scorers. (C)</p> Signup and view all the answers

What does the term 'bias' refer to in the context of testing?

<p>Systematic variation that is unrelated to the construct being measured. (D)</p> Signup and view all the answers

What type of validity evidence best sheds light on whether a college admissions test is valid for selecting students who will complete the program within four years?

<p>Predictive validity. (A)</p> Signup and view all the answers

What results in a negative item-discrimination index?

<p>More high scorers get the item correct. (B)</p> Signup and view all the answers

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Study Notes

Correlation Coefficient

  • The Pearson correlation coefficient is a measure of the linear relationship between two continuous variables.

Test Reliability

  • Adding items to a test will typically increase the test's reliability.
  • Test reliability can be estimated by correlating pairs of scores from the same person on two different administrations of the same test, which is known as test-retest reliability.

Parallel Forms

  • Parallel forms of a test are different forms of the same test that are designed to be equivalent in terms of content, format, and difficulty.

Types of Validity

  • Face validity is not a type of validity.
  • Validity evidence can be used to determine whether a test is valid for a specific purpose, such as selecting students who will complete a college program within four years.

False Positives

  • A false positive occurs when a test result incorrectly indicates that a person has a particular trait or characteristic, such as a medical condition.

Standard Error of Measurement

  • The formula for the standard error of measurement does not include the number of test items.

Good Test Items

  • A "good" test item is one that is able to distinguish between individuals who are high or low on the trait being measured.

Bias in Testing

  • Bias in testing refers to the tendency of a test to produce different results for different groups of people, such as different ethnic or gender groups.

Validity Evidence

  • Predictive validity evidence is best suited to determine whether a test is valid for selecting students who will complete a college program within four years.

Item-Discrimination Index

  • A negative item-discrimination index results when a test item is easier for low-ability individuals than for high-ability individuals.

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