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

## A. The rate of

A. The rate of learning for the sample of rats tested with colorful wallpaper will be no different than the population of rats tested under ordinary circumstances. • B. The rate of learning for the sample of rats tested with colorful wallpaper will be faster than the population of rats tested under ordinary circumstances. • C. The rate of learning for the population of rats tested with colorful wallpaper will be no different than the population of rats tested under ordinary circumstances. • D. The rate of learning for the population of rats tested with colorful wallpaper will be faster than the population of rats tested under ordinary circumstances. Question 13 of 20 5.0/ 5.0 Points Anxiously-attached individuals in the general population tend to have low levels of satisfaction in their romantic relationships (μ = 10, σ = 5, positively skewed distribution). A therapist interested in increasing relationship satisfaction provides a week-long relaxation seminar to 11 anxious individuals. After completing the seminar, relationship satisfaction in the sample averages 12. What is the corresponding Z score for the sample's mean score on the comparison distribution? • A. 0.66 • B. 1.32 • C. 0.44 • D. 1.74 Question 14 of 20 0.0/ 5.0 Points Anxiously-attached individuals in the general population tend to have low levels of satisfaction in their romantic relationships (μ = 10, σ = 5, positively skewed distribution). A therapist interested in increasing relationship satisfaction provides a week-long relaxation seminar to 11 anxious individuals. After completing the seminar, relationship satisfaction in the sample averages 12. What is the shape of the comparison distribution? • A. Positively skewed • B. Negatively skewed • C. Approximately normal • D. Cannot be determined from the information provided Question 15 of 20 5.0/ 5.0 Points If a population is not normally distributed, the shape of a distribution of means: • A. will always be normal. • B. will never be normal. • C. will be normal when the sample size is more than 30. • D. will not be normal when the sample size is more than 30. Question 16 of 20 0.0/ 5.0 Points An experimental psychologist is interested in whether the color of an animal's surroundings affects learning

ate. 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. If the mean score of the sample is more extreme than the cutoff score on the comparison distribution, the psychologist will conclude that: • A. the null hypothesis that the rats in the sample will learn more is supported. • B. the wallpaper did not have a significant effect on the rate of learning. • C. the color of the chamber had a significant effect on the rate of learning. • D. the results are inconclusive since the null hypothesis cannot be rejected. Question 17 of 20 5.0/ 5.0 Points When the standard deviation of the original population is small, the experiment tends to: • A. have a higher level of power. • B. have a lower level of power. • C. show a less significant difference between the two populations. • D. have a high level of Type II error. Question 18 of 20 5.0/ 5.0 Points Effect size is: • A. the amount of statistical importance a particular finding has in psychological practice. • B. the power of a study divided by the sample size. • C. the sample size multiplied by 1 – beta. • D. the degree to which an experimental manipulation separates two populations. Question 19 of 20 5.0/ 5.0 Points The comparison distribution for the mean of a sample is the distribution of means because: • A. comparing the mean of a sample to a distribution of a population of scores of individuals is a mismatch. • B. the available population parameters are inaccurate and reflect too little variance within the population. • C. the distribution of means is likely to have more varied scores than would be represented in the population. • D. the proper comparison distribution is stated in the research hypothesis. Question 20 of 20 5.0/ 5.0 Points The standard deviation of a distribution of means is sometimes called "the standard error of the mean," or the "standard error," because: • A. it is an inaccurate estimate of a sample standard deviation and cannot be used to determine the variance. • B. it is calculated by summing the errors figured by subtracting sample means from the population variance. • C. it is frequently used as an "error term" when calculating the estimated sample variance.

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