Chapter 3: Some Key Ingredients For Inferential Statistics Question Preview (ID: 58764)


Statistics For Psychology. TEACHERS: click here for quick copy question ID numbers.

In a distribution of Z scores, the mean is always
a) 1
b) 10
c) 0
d) 5

Which of the following statements regarding Z scores is FALSE?
a) It indicates whether the raw score is above or below average.
b) It indicates whether or not a distribution is skewed.
c) It indicates the percentage of cases between that score and the mean.
d) It is sometimes referred to as a standard score.

If the mean of a test is 13 and its standard deviation is 3, the Z score for a person with a raw score of 7 is
a) –2
b) –1
c) 1
d) 2

Using the percentage approximations for the normal curve, the percentage of scores between the mean and one standard deviation below the mean is
a) 14%
b) 50%
c) 34%
d) 14% + 34% = 48%

The symbol used to indicate a population parameter is usually
a) a Greek letter.
b) an ordinary letter with a tilde mark (~) or hat mark (^).
c) a Hebrew letter.
d) an ordinary letter with a bar over it.

The symbol for the standard deviation of a sample is
a) σ²
b) SD²
c) σ
d) SD

The term relative frequency refers to
a) the expected number of times a particular outcome of an experiment will be obtained.
b) the frequency of a particular result when an experiment is repeated.
c) the expected result if an experiment is repeated frequently.
d) the number of times something occurs relative to the number of times it could have occurred.

If a student who wants to study alcohol use at a high school obtains a complete list of the students and has a blindfolded person select as many people as needed for the study, the student is conducting
a) random selection.
b) haphazard selection.
c) specified selection.
d) quota selection.

If the mean score on a creativity test is 20, the standard deviation is 5, and the distribution is normal, the percentage of people who would obtain scores between 15 and 25 is
a) 34%
b) 14% + 34% = 48%
c) 50%
d) 34% + 34% = 68%

If the mean score on a stress scale is 5, the standard deviation is 2, and the distribution is normal, what would be the mean value when converted to a Z distribution?
a) 0
b) 2
c) 5
d) 7

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