LECTURE 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is the importance of individual differences in psychological test data? | They make up variability in the data
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| Why is there always variability in data? | All individuals are different
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| What is systematic variability? | A consistent trend in data across all individuals
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| What is the meaning of variance (s^2) in data? | It represents the average degree to which people differ from each other, and thus is a measure of variability.
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| What is the meaning of standard deviation (SD)? | It reflects variability in terms of the size of raw deviation scores.
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| What is the size of variance dependent on? | 1.The degree to which the scores in a distribution differ from each other 2. The metric of the scores in the distribution (e.g. scale of the test)
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| How is co-variance computed? | It is coomputed from variability among scores in two different distributons of scores.
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| What are the two pieces of information given by correlation scores? | The direction of the association, and the magnitude of the association.
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| What are the three tpes of reliability? | Test-retest reliability, inter-rater reliability, internal consistency reliability
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| How is Cronbach's alpha computed? | 1. Scores for each item obtained
2. Obtain the variance and covariance between the items
3. Sum the covariances among all pairs of items
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| What does internal consistency reliability AKA Cronbach's alpha show? | Sum of covariances reflects degree to which responses to all items are consistent with each other. The larger this sum, the more consistent the items are.
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