QUESTION 17

A sample of university students has an average weight of 74.6 kg. Which of the following is an impossible value for the standard deviation?

a) 74.6

b) 12.4

c) -12.4

d) 0.0

QUESTION 18

The mean, median and mode can never all be the same.

True

False

QUESTION 19

The mean score of an assessment for all subjects in a medical study was 2.77. A subject with a score of 2.0 wants to know her relative standing in relation to the mean score. A numerical summary that would be useful for this purpose is the

a) median

b) standard deviation

c) the number of subjects in the study

d) interquartile range

QUESTION 20

The median of a Normal distribution enables us to calculate:

a) The size of the variable

b) The location of the peak of the distribution

c) The total area under the Normal curve

d) None of the above

QUESTION 21

In a survey of 750 Americans conducted by the Gallop organisation, 24% indicated a belief in reincarnation. Using the appropriate methods to predict the confidence interval for all Americans, the percentage believing in reincarnation falls between 21% and 27%. The prediction is an example of

a. descriptive statistics

b. a data file

c. inferential statistics

d. designing a study

QUESTION 22

A Normal distribution will have (SELECT ALL THAT APPLY):

a) A bell shaped curve

b) Exactly 50% of the distribution will be on either side of the mean

c) The mean and median will be identical

d) A mean of zero and a standard deviation of 1

QUESTION 23

Which is the process of gathering evidence supporting inferences based test scores?

a) Prediction

b) Validation

c) Validity

d) Reliability

QUESTION 24

Which of the following statements accurately describes test-retest reliability?

a) Measure of consistency with which a test measures a single construct or concept

b) Measure of degree of agreement between two or more scorers, judges, or raters

c) Measure of consistency of scores obtained from two equivalent halves of the same test

d) Measure of consistency of test scores over time

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