TEXT BOOK
(ISBN10: 1111837260) ====9781111837266 Understanding Statistics in the Behavioral Sciences by
Pagano, Robert R.
1. Chapter 17 # 17, 20, 24, 26, 29
17). A study was conducted to determine whether big-city and small town dwellers differed in their helpfulness to strangers. In this study, the investigators rang the doorbellsof strangers in living in Newyork city or small towns in the vicinity. They explained they had misplaced the address of a friend living in a neighoborhood and asked to use the phone. The following data show the number of individuals who admitted or did not admit the strangers (the investigators) into their homes:
Helpfulness to strangers
Big-city dweller small -town dweller Admitted strangers into their homes Did not admit strangers into their home
60 90 150
70 30 100
130 120 250
Do big city dwellers differ in their helpfulness to strangers? Use α=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 hypnotizability. Assume the data violate the assumptions required for use of the F-test but are at least of ordinal scaling.
Condition 1 lawyers Condition 2 Physician Condition 3 Dancers
26 14 30
17 19 21
27 28 35
32 22 29
20 25 37
25 15 34
Using α=0.05, what is your conclusion?
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, and seven third born subjects. Each subject is given an assertiveness test, with the following results. High scores indicate greatest assertiveness. Assume 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.
Condition 1 first born Condition 2 second born Condition 3 third born
18 18 7
19
21 30
28 22 18
32 1 5
10 14
Use α=0.01 to evaluate the data. What is your conclusion?
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, a large oil companies really does result in more favorable attitudes. Tweleve individuals are run in a replicated measures design. In the before condition, each subject fills out a questionnaire designed to asses attitudes towad a large oil companies. In the after condition the subject see the film after which they fill out the questionnaire. The following scores are obtained. High scores indicated more favorable attitudes towar large oil companies.
Before After
43 45
48 60
25 22
24 33
15 7
18 22
35 41
28 21
41 55
28 33
34 44
12 23
Analyzxe data using the Wilcoxon signed ranks test with α=0.051tail.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 theology department and 12 professors from 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 non-directional hypothesis is appropriate because there are insufficient theoretical and empirical bases to warrant a directional hypothesis.
b). What is null hypothesis?
c). What is your conclusion? Use the Mann-Whitney U-test and α=0.0521tail