Which measure of variability describes the average deviation of each score from the mean?
a) range
b) standard deviation
c) mode
d) mean
Which of the following has the largest potential to decrease the accuracy of an inference made to a population based on a sample?
a) variance
b) a heterogeneous sample
c) a homogeneous sample
d) sampling error
Which correlation coefficient indicates the strongest relationship?
a) 0.00
b) +0.50
c) -0.70
d) +0.60
When comparing the following two distributions, which of the following statements is true?
Data Set 1: 10, 15, 20, 25, 30
Data Set 2: 16, 18, 20, 22, 24
a) Data Set 1 has a smaller mean than Data Set 2.
b) Data Set 1 has a larger standard deviation than Data Set 2.
c) Both data sets have the same range.
d) The mean is larger than the median in both data sets.
What does the central limit theorem enable researchers to do?
a) compare means from two independent samples
b) generalize the results from a sample to a population without knowing the exact nature of the population's distribution
c) compute the significance of a relationship between two variables
d) reduce the possibility that chance accounts for variability in the variable of interest
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