The measure of variability within the group in a z-test is the population mean, μ.

Question 1The measure of variability within the group in a z-test is the population mean, μ.

  True

  False

 Question 2A statistically significant outcome in a z-test indicates which of the following?

  The sample is not characteristic of the population

  The sample could not have been randomly selected

  The sample is characteristic of the population

  The sample represents other samples in the original population

 Question 3“Random selection” refers to which of the following?

  Selecting in order to accommodate each of the major subgroups

  Selecting every “nth” person so as to be representative

  Selecting the most convenient group

  Selecting so that everyone has an equal chance of inclusion

 Question 4In a distribution for which the mean is 25 and the standard deviation is 5, what percentage of all scores occur between 20 and 30?

  34.13%

  68.26%

  84.13%

  92.39%

 Question 5A z score of 2.0 is two standard deviations above the mean of the distribution (t).

  True

  False

 Question 6A distribution where the mean and std. deviation have pre-determined values calls for which?

  Raw scores

  z scores

  Modified standard scores

  Percentile rankings

 Question 7The central limit theorem maintains which?

  All data in a population are normal

  Any distribution can be turned into a z distribution

  All values tend toward the center of the distribution

  Distributions based on samples tend to be normal

 Question 8If you took a test, your standard score would indicate how many standard deviations you ended up away from the ______.

  Mean

  High Score

  Low score

  Median

 Question 9What are the common elements among z scores, the z-test, and the t-tests?

  All require ordinal scale data

  All have measures of within-group variability in the numerator

  They’re all tests of significant differences

  All the numerators are difference scores

 Question 10In the t-test, the dependent variable is nominal scale.

  True

  False

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