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Stastitics 1342 Exam 1

front 1

Does the level of octane in gasoline affect gas​ mileage? To answer this​ question, an automotive engineer obtains 7575 cars. Twenty dash five twenty-five of the cars are​ compact, 2525 are full​ size, and 2525 are sport utility vehicles​ (SUVs). Design an experiment for the engineer.

What type of experimental design should the engineer​ use?

A. Matched Pair

B. Randomized block design

C. Completely randomized design

D.​ Case-control

back 1

B. Randomized block design

front 2

To determine her heart rate​, Charlotte divides up her day into three​ parts: morning,​ afternoon, and evening. She then measures her heart rate at 3 randomly selected times during each part of the day

A. Stratified
B. Systematic
C. Simple random
D. Cluster
E. Convenience

back 2

A. Stratified

front 3

Does the level of octane in gasoline affect gas​ mileage? To answer this​ question, an automotive engineer obtains 90 cars. Thirty of the cars are​ compact, 30 are full​size, and 30 are sport utility vehicles​ (SUVs). Design an experiment for the engineer.

A. Randomized block design
B. Completely randomized design
C. Case-control
D. Matched pair

back 3

A. Randomized block design

front 4

The survey has bias.​ (a) Determine the type of bias.​ (b) Suggest a remedy.A polling organization conducts a study to estimate the percentage of households that have more than have more than one computer. It mails a questionnaire to 1083 randomly selected households across the country and asks the head of each household if he or she has more than one computer. Of the 1083 house holds​ selected, 4545 responded.

Which of these best describes the bias in the​ survey?

A. Sampling bias

B. Response bias

C. Nonresponse bias

D. Undercoverage bias

How can the bias be​ remedied?

A. The polling organization should try contacting households that do not respond by phone or​ face-to-face.

B. The polling organization should only select households in a single state.

C. The polling organization should mail the questionnaire to a greater number of households.

D. The polling organization should mail the questionnaire to each person in the households.

back 4

C. Nonresponse bias

A. The polling organization should try contacting households that do not respond by phone or​ face-to-face.