PS390 Statistical Reasoning in Psychology Exam 3 Answers (Ashworth College)

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C. the same as the original population mean.
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D. the sample mean multiplied by the variance.
Question 4 of 20
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An experimental psychologist is interested in whether the color of an animal's surroundings affects learning
rate. He tests 16 rats in a box with colorful wallpaper. The average rat (of this strain) can learn to run this type
of maze in a box without any special coloring in an average of 25 trials, with a variance of 64, and a normal
distribution. The mean number of trials to learn the maze, for the rats tested with the colorful wallpaper, is 11.
What is the μ M ?
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A. 8
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B. 11
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C. 25
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D. 64
Question 5 of 20
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Which of the following statements regarding confidence intervals is FALSE?
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A. Confidence intervals are misused more often than significance tests.
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B. Confidence intervals can be used in hypothesis testing.
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C. Confidence intervals emphasize numerical estimates.
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D. Confidence intervals are sometimes reported in research articles.
Question 6 of 20
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A 95% confidence interval is figured by finding:
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A. the Z score for the bottom 5% of the distribution.
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B. the Z score for the upper 95% of the distribution.
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C. the cutoff points for the lower 2.5% and the upper 2.5% of the distribution.
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D. the cutoff points for the lower 5% and the upper 5% of the distribution.
Question 7 of 20
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Some psychologists have argued that simple significance tests are misleading, and that a better statistic to
evaluate the outcome of an experiment would be the:
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A. effect size.
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B. level of power.
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C. probability of a Type II error.
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D. number of participants divided by the standard deviation.
Question 8 of 20
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The standard deviation of a distribution of means is: