1. A dependent-samples (repeated-measmes) t-test is appropriate when a the value for the population variance is known. b. the mean for a treated group of subjects is compared to lem population mean. c. one sample is measured twice - before and aer receiving a treatment. d. there are two separate samples containing different subjects. 21 Au independent-samples study would be appropriate for which of the following situations? a w attitudes scores for the same trainees before and alter receiving training b. m personality scores for individuals diagnosed with an eating disorder and those who are not diagnosed or my salary levels for college graduates' rst job and their salaries 10 years aer graduation d. compare reaction times for people before and alter they take a pain medication For questions 3 and 4, answer the following questions using another sheet of paper if needed: a What are the null and alternative hypotheses? (lpt) b. What are the degrees of eedom and the critical value? (1/2pt) 0. Calculate the statistic show all your work. (Spts for #3, 4pts for #4) d What is the statistical decision (reject or fail to reject) and what is the study conclusion? (lpt) 3. A respected theory suggests that professors with offices on upper oors are friendlier than those in the basement because of sunlight To test this theory, a sample of professors from the 2ndoor and the basement of a building on campus take a lO-ilem friendliness inventory (higher score = more iendly). Is the theory supported? Use a l-tailed, independent-samples t-test with a. = .05 to test this theory. Scores for professors in the basement: 2, 6, 1, 2 Scores for professors on 2nd-oor: 19, S, 18, 16 4. A researcher would like to determine if relaxation training affects the number of headaches for chronic headache sufferers For a week prior to training, each participant records the number of headaches suffered. Participants then receive relaxation training and for the week following training, the number of headaches is again measured. Given the following data, analyze the effect of the training using a 2-tailed (non-directional) dependent (related)-samples t-test, o. = '05. Aer Before Participant Training \\DOO\\l0\\UI>WN>n ottoman-bloat.- bwmateoqmmn Area Under the Curve Practice Problems Graduating seniors at IOU were polled and asked what they expected to pay for their rst vehicle once they have obtained a job. The mean expected price was $21,500. The standard deviation was $1750. Answer the following questions using the unit normal table in your text. A. What proportion of students expect to pay more than $24,000'.7 B. If I randomly sample 1 student, what is the probability that this student will expect to pay more than $20,000? C. Again sampling 1 student, what is the probability that s/he will expect to buy a car between $19,000 and $23,000? D. What score represents the 90'\" percentile