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(Solved) Hello, I need help with the attached homework problem on Econ.. I


I am curious which answers were wrong and if you could provide me with feedback as well as explanations why it was wrong, and what the right answer would be. Thank you for you assistance. 


RES 351 Business Research

 


 

Questions

 


 

Answers

 


 

.1 Which hypothesis-testing procedure would you use in the

 

following situation?

 

Your manager wants to know whether there is a significant

 

difference between the average times required to complete a

 

particular task for the three levels of technician experience

 

(one year on job, two years on job, three years on job).

 

__H__

 


 

.2 Which hypothesis-testing procedure would you use in the

 

following situation?

 

YumYum Candy Company sells a jelly bean mixture. The

 

company claims that 30% of the jelly beans are cherry

 

flavored, 60% are lemon, and 10% are peach. The jelly

 

beans are sold in packages of 100. Suppose a randomlyselected package of jelly beans has 50 cherry, 45 lemon,

 

and 5 peach jelly beans. Is this consistent with YumYum?s

 

claim? __C__

 


 

.3 Which hypothesis-testing procedure would you use in the

 

following situation?

 

An auto parts store has a customer satisfaction rating of 88

 

percent. Is this store?s rating significantly different from the

 

national average of 94 percent? __I__

 


 

.4 Which hypothesis-testing procedure would you use in the

 

following situation?

 

A company is testing a new diet pill. They ask a group of 37

 

people to rate their hunger before taking the pill and after

 

taking the pill. Then they examine the results to see if there

 

was a significant improvement in hunger ratings. __O__

 


 

.5 Which sampling method is used in the following example?

 

A researcher needs to draw a sample of children from an

 

elementary school. She first randomly selects five classes

 

from the school. Then she measures all students in the

 

selected classes. __F__

 


 

A. Simple random

 

B. Stratified

 

C. Judgment

 

D. Snowball

 

E. Convenience

 

F.

 


 

Cluster

 


 

G. Ex post facto

 

H. ANOVA

 

I.

 


 

Chi-square test

 


 

J.

 


 

Stability

 


 

K. Regression

 

L. Extrapolation

 

M. Two-related-samples test

 

N. Two-independentsamples test

 


 

O. One-sample test

 

P. Intra-rater

 

Q. Systematic

 


 

.6 Which sampling method is used in the following example?

 

A researcher is studying orthopedic surgeons but can only

 

find five. She asks these surgeons if they know any more.

 

They give her several further referrals, who in turn provide

 

additional contacts. In this way, she is able to contact

 

sufficient surgeons. __D__

 


 

.7 __C__

 

Which of the following is a true statement?

 

A) Although a correctly designed experiment can strongly

 


 

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suggest a cause-and-effect relationship, the only way of

 

firmly establishing such a relationship is through a complete

 

census.

 

B) If correctly designed, an observational study can

 

establish a cause-and-effect relationship just as effectively

 

as a correctly designed experiment.

 

C) A controlled experiment is often conducted in order to

 

establish a cause-and-effect relationship that was first

 

suggested by an observational study.

 

D) A simple method for overcoming bias in observational

 

studies is to increase the sample size.

 

E) In an experiment, the control group consists of selfselected participants who choose not to receive a

 

designated treatment.

 


 

.8 __B__

 

Which descriptive statistic is usually considered most

 

appropriate for describing nominal data?

 

A) Mean.

 

B) Mode.

 

C) Variance.

 

D) Range.

 

E) Median.

 


 

.9 __D__

 

An internet provider asks a consultant to contact 130

 

residential clients and measure their level of satisfaction with

 

their internet service. The consultant obtains an

 

alphabetized list of client names and starting with the letter

 

A, uses a random number generator to pick five names from

 

this group. The consultant uses the same selection method

 

for each of the other 25 letters and combines the 5 × 26 =

 

130 names into a group of clients to be surveyed.

 

Which of the following statements is true?

 

A) The selection method makes use of chance.

 

B) The selection method results in a single-stage cluster

 

sample.

 

C) Each client has an equal probability of being included in

 

the survey.

 

D) The selection method introduces bias through sampling

 

error.

 


 

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E) For a sample this size, it is best to let the researcher

 

hand pick a representative set of clients.

 


 

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