Online polls Parade magazine posed the following question: “Should drivers be banned

from using all cell phones?” Readers were encouraged to vote online at parade.com. The

subsequent issue of Parade reported the results:2407(85%)said “Yes” and 410(15%)

said “No.”

a. What type of sample did the Parade survey obtain?

b. Explain why this sampling method is biased. Is 85%probably greater than or less than

the true percent of all adults who believe that all cell phone use while driving should be

banned? Why?

Short Answer

Expert verified

a) The subjects can decide whether or not they want to be included in the sample.The sample is a voluntary response sample

b) They have data about the strongest opinions, resulting because persons with the strongest opinions choose to engage in a voluntary response sample.

Step by step solution

01

Part (a) Step 1: Given information

We have to tell about type of sample did the counsellor obtain.

02

Part (a) Step 2: Explanation

We note that the sample in the exercise prompt is a voluntary response sample. The sample is a voluntary response sample because the subjects must choose whether or not to call the telephone number (if they do, they will be included in the sample), and thus the subjects can decide whether or not they want to be included in the sample.

03

Part (b) Step 1: Given information 

We have to tell about true percent of all adults who believe that all cell phone use while driving

04

Part (b) Step 2: Explanation

Because persons with the strongest opinions choose to engage in a voluntary response sample, we will only have data about the strongest opinions, resulting in us continuously overestimating or underestimating the actual opinions.

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Most popular questions from this chapter

When we take a census, we attempt to collect data from

a. a stratified random sample.

b. every individual chosen in a simple random sample.

c. every individual in the population.

d. a voluntary response sample.

e. a convenience sample.

SRS of engineers? A corporation employs 2000 male and 500 female engineers. A stratified random sample of 200 male and 50 female engineers gives every individual in the population the same chance to be chosen for the sample. Is it an SRS? Explain your answer.

A TV station wishes to obtain information on the TV viewing habits in its market area.

The market area contains one city of population 170,000, another city of70,000, and

four towns of about 5000residents each. The station suspects that the viewing habits

may be different in larger and smaller cities and in the rural areas. Which of the

following sampling designs would yield the type of information the station requires?

a. A stratified sample from the cities and towns in the market area

b. A cluster sample using the cities and towns as clusters

c. A convenience sample from the market area

d. A simple random sample from the market area

e. An online poll that invites all people from the cities and towns in the market area to

participate.

Tweet, tweet! What proportion of students at your school use Twitter? To find out, you survey a simple random sample of students from the school roster.

a. Will your sample result be exactly the same as the true population proportion? Explain your answer.

b. Which would be more likely to produce a sample result closer to the true population value: an SRS of 50students or an SRS of 100students? Explain your answer.

Initial public offerings (1.3) The business magazine Forbes reports that 4567companies sold their first stock to the public between 1990and 2000. The mean change in the stock price of these companies since the first stock was issued was +111%. The median change was -31%. Explain how this difference could happen.

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