Project #32094 - Statistics

 

Complete the following exercises from "Questions and Problems" located at the end of the chapter and put them into a Word document to be submitted as directed by the instructor.

 

1.    Chapter 17 # 17, 20, 24, 26, 29

 

 

 

CHAPTER 17

 

(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

 

doorbells of strangers living in New York City or

 

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 did not admit the strangers (the investigators) into

 

their homes:

 

Helpfulness to Strangers

 

Admitted

 

strangers into

 

their home

 

Did not admit

 

strangers into

 

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.

 

Social

 

 

 

(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. Using _ _ 0.05, what is

 

your conclusion?

 

Condition 1

 

Lawyers

 

Condition 2

 

Physicians

 

Condition 3

 

Dancers

 

26 14 30

 

17 19 21

 

27 28 35

 

32 22 29

 

20 25 37

 

25 15 34

 

Cognitive, social

 

(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 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

 

First-Born

 

Condition 2

 

Second-Born

 

Condition 3

 

Third-Born

 

18 18 7

 

8 12 19

 

4 3 2

 

21 24 30

 

28 22 18

 

32 1 5

 

10 14

 

Social

 

(26). A major oil company conducts an experiment to

 

assess whether a fi lm 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 toward large oil companies.

 

In the “After” condition, the subjects see the

 

fi lm, 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

 

28 33

 

34 44

 

12 23

 

Analyze the data using the Wilcoxon signed ranks

 

test with _ _ 0.051 tail. What do you conclude? I/O

 

(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

 

Professors

 

Psychology

 

Professors

 

36 13

 

42 25

 

22 40

 

48 29

 

31 10

 

35 26

 

47 43

 

38 17

 

12

 

32

 

27

 

32

 

social

 

 

 

Subject Mathematics
Due By (Pacific Time) 06/02/2014 12:00 am
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