Q: In a Pew Research Center poll, 331 of 1,182 respondents said that driving is a chore. What percentage of respondents said that driving is a chore?

$$ \frac{331}{1,182} \times 100 \approx 28\% $$

Question 1

A pharmaceutical company implements a quality control plan where every 500th pill produced is selected and tested to confirm it contains 80 mg of atorvastatin. What type of sampling method is being used?

Accepted Answer

Systematic sampling

Question 2

Gallup wants to test for a gender difference in online purchasing habits. They survey 500 randomly selected men and 500 randomly selected women. Which sampling method is this?

Accepted Answer

Stratified sampling

Question 3

A list of 1,736,997 adults in Manhattan is numbered from 1 to 1,736,997. A computer randomly generates 500 numbers between 1 and 1,736,997, and the adults corresponding to those numbers are surveyed. What sampling method is this?

Accepted Answer

Simple random sampling

Question 4

A statistics student creates a survey and presents it to fellow statistics students. What type of sampling is this?

Accepted Answer

Convenience sampling

Question 5

The Commissioner of Major League Baseball randomly selects one team from the American League and one from the National League, then surveys all players on those teams. What sampling method is this?

Accepted Answer

Cluster sampling

Question 6

Are the population sizes of the different states discrete or continuous variables?

Accepted Answer

Discrete

Question 7

What is the level of measurement for the number of residents in different states?

Accepted Answer

Ratio

Question 8

A researcher mails questionnaires to 10,000 randomly selected state residents. What is a major concern with this method?

Accepted Answer

It may result in nonresponse bias

Question 9

If 50 full-time workers are randomly selected in each of the 50 states, what type of sample is obtained?

Accepted Answer

Stratified sample

Question 10

If two states are randomly selected and all adult residents in those states are surveyed, what type of sample is this?

Accepted Answer

Cluster sample

Question 11

A label on a protein bar claims it contains '125% less fat than the leading chocolate candy brands.' What is wrong with this claim?

Accepted Answer

A reduction of more than 100% is not possible; it would imply negative fat

Question 12

In a Pew Research Center poll on driving, 58% of 1,182 respondents said they like to drive. What is the actual number of respondents who said they like to drive?

Accepted Answer

$$ 1,182 	imes 0.58 = 685 $$

Question 13

In a Pew Research Center poll, 331 of 1,182 respondents said that driving is a chore. What percentage of respondents said that driving is a chore?

Accepted Answer

$$ \frac{331}{1,182} 	imes 100 \approx 28\% $$

Question 14

At Albany Medical Center, every 10th newborn baby is selected and their body temperature is measured in degrees Fahrenheit. What is the level of measurement for body temperature?

Accepted Answer

Interval

Question 15

A pollster stops each person passing her office door and asks them to rate the last movie they saw on a scale of 1 to 4 stars. What type of sampling is this?

Accepted Answer

Convenience sampling

Question 16

A clinical trial of a new IVF procedure results in 239 boys born among 291 births. If the method has no effect, there is less than a 1% chance of such an extreme result. What can be concluded?

Accepted Answer

The result is statistically significant but may not be practically significant

Question 17

Which of the following is an example of a nominal level of measurement?

Accepted Answer

Political party affiliation

Question 18

A researcher wants to compare the average income of teachers in urban and rural areas. Which sampling method would best ensure representation from both groups?

Accepted Answer

Stratified sampling

Question 19

A poll asks: 'Are you in favor of an act that for federal and state aid, only heterosexual marriages should be recognized?' What is a potential issue with this question?

Accepted Answer

It is a leading question that may bias responses

Question 20

A researcher selects 50 voters from each of the 50 states and identifies their political party affiliations. What is the level of measurement for political party affiliation?

Accepted Answer

Nominal

Fundamental Concepts and Applications in Statistics: Sampling, Data Types, and Significance

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