Statistics Quiz

What does variability refer to in a distribution of scores?

• The difference between scores in a distribution

• The average of all scores

• The highest score in the distribution

• The lowest score in the distribution

What does the range of a distribution show?

• The spread of scores from smallest to largest

• The standard deviation of the scores

• The distance between the mean and median

• The mode of the distribution

What does deviation refer to in statistics?

• The distance from the mode

• The distance from the median

• The distance from the mean

• The distance from the range

What does the Z-score provide information on?

• The average difference of scores from the mean

• How far a score is from the mean in standard deviations

• The relationship between two variables

• The spread of scores

What does a positive correlation between two variables indicate?

• They tend to change in the same direction

• They are not related at all

• They tend to change in opposite directions

• There is no consistency between them

What does Pearson R correlation coefficient measure?

• The range of scores in a distribution

• The strength of linear association between two variables

• The mode of the distribution

• The standard deviation of the scores

What is the calculation of variance used for?

• To determine the reliability of measurements

• To calculate the mean of a distribution

• To find the mode of a set of scores

• To measure the range of scores

What is the standard deviation in a sample of test scores if the variance is 4.8?

• 2.19

• 1.5

• 3.0

• 5.6

When is a measurement procedure considered reliable?

• When it has a low standard deviation

• When it has a high range of scores

• When it produces stable and consistent measurements

• When it produces inconsistent measurements

What does no correlation between two variables indicate?

• They tend to change in opposite directions

• They are not related at all

• They tend to change in the same direction

• There is no consistency between them