Grand canyon psy520 module 8 assignment

PSY 520 – 0500 Graduate Statistics
Module 8 Assignment
Questions and Problems: Chapter 17 # 17, 20, 24, 26, 29


17. A study was conducted to determine whether big-city and small-town dwellers differed in their helplessness to strangers. In this study, the investigators rang the doorbells of strangers living in New York or in small towns in the vicinity. They explained they had misplaced the address of a friend living in the neighborhood and asked to use the phone. The following data show the number of individuals who admitted or who did not admit the strangers (the investigators) into their homes:

Helpfulness to Strangers
Allowed Did Not
Strangers into Their Allow Strangers into
Home Their Home
Big-City Dweller 60 90 150

Small-Town Dweller 70 30 100
130 120 250
Do big-city dwellers differ in their helpfulness to strangers? Use ? = 0.05 in making your decision.

20. A researcher believes that individuals in different occupations will show differences in their ability to be hypnotized. Six lawyers, six physicians, and six professional dancers are randomly selected for the experiment. A test of hypnotic susceptibility is administered to each. The results are shown in the next column. The higher the score, the higher the hypnotic ability. Assume the data violate the assumptions required for use of the F test, but are at least of ordinal scaling. Using ? = 0.05, what is your conclusion?
Condition 1 Condition 2 Condition 3
Lawyers Physicians Dancers
26 14 30
17 19 21
27 28 35
32 22 29
20 25 37
25 15 34

24. A psychologist investigates the hypothesis that birth order affects assertiveness. Her subjects are 20 young adults between 20 and 25 years of age. There are seven first-born, six second-born, and seven third –born subjects. Each subject is given an assertiveness test, with the following results. High scores indicate greater assertiveness. Assume that the data are so far from normally distributed that the F test can't be used, but the data are at least of ordinal scaling. Use ? = 0.01 to evaluate the data. What is your conclusion?

Condition 1 Condition 2 Condition 3
First -born Second -Born Third - born
18 18 7
8 12 19
4 3 2
21 24 30
28 22 18
32 1 5
10 14


26. A major oil company conducts an experiment to assess whether a film designed to tell the truth about, and also promote more favorable attitudes toward, large oil companies really does result in more favorable attitudes. Twelve individuals are run in a replicated measures design. In the “Before” condition, each subject fills out a questionnaire designed to assess attitudes towards large oil companies. In the “After” condition, the subjects see the film, after which they fill out the questionnaire. The following scores were obtained. High scores indicate more favorable attitudes toward large oil companies.
Before After
43 45
48 60
25 22
24 33
15 7
18 22
35 41
28 21
41 55
26 33
34 44
12 23
Analyze the data using the Wilcoxon signed scale test with ? = 0.052 tail. What do you conclude?

29. A social scientist believes that university theology professors are more conservative in political orientation than their colleagues in psychology. A random sample of 8 professors from the theology department and 12 professors from the psychology department at a local university are given a 50 – point questionnaire that measures the degree of political conservatism. The following scores were obtained. Higher scores indicate greater conservatism.
a. What is the alternative hypothesis? In this case, assume a nondirectional hypothesis is appropriate because there are insufficient theoretical and empirical bases to warrant a directional hypothesis.
b. What is the null hypothesis?
c. What is your conclusion? Use the Mann – Whitney U test and ? = 0.052 tail.

Theology Psychology
Professors Professors
36 13
42 25
22 40
48 29
31 10
35 26
47 43
38 17
12
32
27
32