Solved: For Exercises 1 through 11, perform each of these

Chapter 9, Problem 8

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For Exercises 1 through 11, perform each of these steps. Assume that all variables are normally or approximately normally distributed. a. State the hypotheses and identify the claim. b. Find the critical value(s). c. Compute the test value. d. Make the decision. e. Summarize the results. Use the traditional method of hypothesis testing unless otherwise specified.Volunteer Work of College Students Females and males alike from the general adult population volunteer an average of 4.2 hours per week. A random sample of 20 female college students and 18 male college students indicated these results concerning the amount of time spent in volunteer service per week. At the 0.01 level of significance, is there sufficient evidence to conclude that a difference exists between the mean number of volunteer hours per week for male and female college students? Male Female Sample mean 2.5 3.8 Sample variance 2.2 3.5 Sample size 18 20