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

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• C. the same as the original population mean. • D. the sample mean multiplied by the variance. Question 4 of 20 5.0/ 5.0 Points 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 ? • A. 8 • B. 11 • C. 25 • D. 64 Question 5 of 20 0.0/ 5.0 Points Which of the following statements regarding confidence intervals is FALSE? • A. Confidence intervals are misused more often than significance tests. • B. Confidence intervals can be used in hypothesis testing. • C. Confidence intervals emphasize numerical estimates. • D. Confidence intervals are sometimes reported in research articles. Question 6 of 20 5.0/ 5.0 Points A 95% confidence interval is figured by finding: • A. the Z score for the bottom 5% of the distribution. • B. the Z score for the upper 95% of the distribution. • C. the cutoff points for the lower 2.5% and the upper 2.5% of the distribution. • D. the cutoff points for the lower 5% and the upper 5% of the distribution. Question 7 of 20 5.0/ 5.0 Points 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: • A. effect size. • B. level of power. • C. probability of a Type II error. • D. number of participants divided by the standard deviation. Question 8 of 20 5.0/ 5.0 Points The standard deviation of a distribution of means is:

• A. figured by subtracting the variance from the sample mean and taking the square root. • B. the square root of the variance of the distribution of means. • C. the population variance divided by the N in each sample. • D. the same as the square root of the sample variance. Question 9 of 20 5.0/ 5.0 Points When conducting an experiment with 95% power, failing to reject the null hypothesis means that: • A. there is no difference between the experimental and control populations. • B. the experiment was poorly conducted. • C. the null hypothesis is true. • D. the chance that the data came from populations with a difference larger than that predicted when calculating power is less than 5%. Question 10 of 20 0.0/ 5.0 Points 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 σ M ? • A. 64/16 = 4.00 • B. √(64/16) = 2.00 • C. 64/11 = 5.82 • D. √(64/11) = 2.41 Question 11 of 20 5.0/ 5.0 Points Power is the probability that: • A. if the research hypothesis is false, the experiment will support the null hypothesis. • B. if the research hypothesis is true, the experiment will support it. • C. a Type I error will not be made. • D. the research hypothesis will not be accepted incorrectly. Question 12 of 20 5.0/ 5.0 Points 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 null hypothesis? •

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