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Chapter 3: Some Key Ingredients For Inferential Statistics
Test Description: Statistics for Psychology
Instructions: Answer all questions to get your test result.
1) In a distribution of Z scores, the mean is always
A
10
B
5
C
1
D
0
2) Which of the following statements regarding Z scores is FALSE?
A
It indicates the percentage of cases between that score and the mean.
B
It indicates whether the raw score is above or below average.
C
It is sometimes referred to as a standard score.
D
It indicates whether or not a distribution is skewed.
3) 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
2
C
1
D
–1
4) Using the percentage approximations for the normal curve, the percentage of scores between the mean and one standard deviation below the mean is
A
50%
B
14% + 34% = 48%
C
34%
D
14%
5) The symbol used to indicate a population parameter is usually
A
a Greek letter.
B
an ordinary letter with a bar over it.
C
a Hebrew letter.
D
an ordinary letter with a tilde mark (~) or hat mark (^).
6) The symbol for the standard deviation of a sample is
A
SD
B
σ²
C
σ
D
SD²
7) The term relative frequency refers to
A
the number of times something occurs relative to the number of times it could have occurred.
B
the frequency of a particular result when an experiment is repeated.
C
the expected number of times a particular outcome of an experiment will be obtained.
D
the expected result if an experiment is repeated frequently.
8) 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
quota selection.
B
random selection.
C
specified selection.
D
haphazard selection.
9) 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
34% + 34% = 68%
C
14% + 34% = 48%
D
50%
10) 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
5
B
7
C
2
D
0
*select an answer for all questions
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