PSY 520 TOPIC 4 EXERCISE, CHAPTER 9, 10, 11 AND 12 ANSWERS

PSY 520 Topic 4 Exercise Chapter 9, 10, 11, 12 9.7: Define the sampling distribution of the mean psy 520 topic 4 exercise. 9.8: Specify three important properties of the sampling distribution of the mean 9.9: If we took a random sample of 35 subjects from some population. The associated sampling distribution of the mean would have the following properties. 9.13: Given a sample size of 36, how large does the population standard deviation have to be in order for the standard error to be 9.14: (a) Random sample of size 144 is taken from local population of grade-school children. Each child estimates the number of hours per week spent watching TV. CHAPTER 10 10.9: The normal range for a widely accepted measure of body size, the body mass index (BMI), ranges from 18.5 to 25. Using the mid-range BMI score of 21.75 as the null hypothesized value for the population mean. Test this hypothesis at the .01 level of significance. Given a random sample of 30 weight-watcher participants who show a mean BMI 5 22.2 and a standard deviation of 3.1. 10.10: Let’s assume that over the years, a paper and pencil test of anxiety yields a mean score of 35 for all incoming college freshmen. We wish to deter-mine whether the scores of a random sample of 20 new freshmen…. Test at the .05 level of significance. 10.11: According to the California Educational Code, students in grades 7–12 should receive 400 minutes of physical education every 10 school days. A random sample of 48 students has a mean of 385 minutes and a standard deviation of 53 minutes. Test the hypothesis at the .05 level of significance that the sampled population satisfies the requirement. psy 520 topic 4 exercise 10.12: According to a 2009 survey based on the United States Census. The daily one-way commute time of U.S. workers averages 25 minutes with a standard deviation of 13 minutes. An investigator wishes to determine whether the national average describes the mean commute time for all workers in the Chicago area… Test the null hypothesis at the .05 level of significance. CHAPTER 11 11.11: Two reasons why research hypothesis is not tested directly……that there is strong suppo