AP STAT 4.2 Quiz retake

In order to assess the opinion of students at the University of Minnesota on a campus snow removal, a reporter for the student newspaper interviews the first 12 students he meets who are willing to express their opinion. the method of sampling used is a. a cluster sample b. a convenience sample c. a simple random sample d. a voluntary response sample e. a census

A convenience sample

Scenario 4-1 A sportswriter wants to know how strongly Lafayette residents support the local minor league baseball team, the Lafayette Leopards. She stands outside the stadium before a game and interviews the first 20 people who enter the stadium. Use Scenario 4-1. The intended population for the survey is a. all Leopard fans b. all people attending the game the day the survey was conducted c. the 20 people who gave the sportswriter their opinion. d. all residents of Lafayette. e. all American adults.

All residents of Lafayette.

Frequently telephone poll takers call near dinner time between 6 pm and 7 pm because most people are at home then. This is a effort to avoid a. a convenience sample. b. response bias c. calling people after they have gone to bed. d. voluntary response bias e. nonresponse

Calling people after they have gone to bed

A maple sugar manufacturer wants to estimate the average trunk diameter of Sugar Maples trees in a large forest. There are too many trees to list them all and take a SRS, so he divides the forest into several hundred 10 meter plots, selects 25 plots at random, and the measures the diameter of every Sugar Maple in each one. This is an example of a a. multistage sample. b. stratified sample c. simple random sample d. convenience sample e. cluster sample.

Cluster sample

An opinion research firm wants to find the country's reaction to a speech by a famous politician. They randomly select six states, then randomly select ten Zip Codes from each state. Fifty people from each Zip Code are randomly selected for the survey. This is an example of a. cluster sampling b. stratified random sampling c. multistage sampling d. convenience sampling. e. simple random sampling.

Multistage sampling

The Bradley effect is a theory proposed to explain observed discrepancies between voter opinion polls and election outcomes in some elections where a white candidate and a non-white candidate run against each other. The theory proposes that some voters tend to tell pollsters that they are undecided or likely to vote for a non-white candidate, and yet, on election day, vote for the white opponent. This is an example of a. undercoverage b. nonresponse c.bias resulting from question wording d. response bias e. voluntary response bias.

Response bias

The public opinion poll in Ohio wants to determine whether or not registered voters in the state approve of a measure to ban smoking in all public areas. They select a simple random sample of fifty registered voters from each county in the state and ask whether they approve or disapprove of the measure. This is an example of a a. simple random sample b. stratified random sample c. multistage sample d. systematic random sample ] e. cluster sample

Stratified random sample

You plan to give a math achievement test to samples of 15 year-olds from both the U.S. and Korea in order to compare mathematics knowledge in the two countries. In each country, you will randomly choose 300 students from low-income families 400 students from middle-income families 200 students from high-income families The sample from Korea is a a. voluntary response sample b. convenience sample c. multistage sample d. simple random sample e. stratified random sample

Stratified random sample

A 1992 Roper poll found that 22% of Americans say that the Holocaust may not have happened. The actual question asked in the poll was "Does it seem possible or impossible to you that the Nazi extermination of the Jews never happened?" and 22% responded possible. The results of this poll cannot be trusted because a. nonresponse is present. Many people will refuse to participate, and those who do will be biased in their opinion. b. the question is clearly biased in the direction of a "possible" answer. c. undercoverage is present present. Obviously , those people who did not survive the Holocaust could not be in the poll. d. we do not know who conducted the poll or who paid for the results. e. the questin is worded in a confusing manner

The question is worded in a confusing manner

Just before the presidential election of 1936, the magazine Literary Digest predicted—incorrectly, as it turned out—that Alf Landon would defeat Franklin Delano Roosevelt. Landon lost in a landslide. It turned out that the magazine had only polled its own subscribers, plus others from a list of automobile owners and a list of people who had telephone service. All three groups had higher than typical incomes during the Great Depression. This is an example of a.voluntary response bias b.bias resulting from questions wording c.response bias d.nonresponse e. undercoverage

Undercoverage

An airline that wants to assess customer satisfaction chooses a Random Sample of 10 of its flights during a single month and asks them to fill out a survey. This is an example of a. cluster sample b. simple random sample c. convenience sample d. multistage sample e. stratified sample

cluster sample

An experiment was conducted by some students to explore the nature of the relationship between a person's heart rate(measured in beats per minute) and the frequency at which that person stepped up and down on steps of various heights. Three rates of stepping and two different step heights were used. A subject performed the activity( stepping at one of the three stepping rates at one of the two possible heights) for three minutes. Heart rate was measured at the end of this period. The variables "stepping rate" and "step height" are the a. factors b. levels c. controls d. response variables e.units

factors

In order to select a sample of undergraduate students in the United States, I selected a simple random sample of four states. From each of these states, I selected a simple random sample of two colleges or universities. Finally, from each of these eight colleges or universities, I selected a simple random sample of 20 undergraduates. My final sample consists of 160 undergraduates. This is an example of a. cluster sampling b. convenience sampling c. multistage sampling d. simple random sampling e. stratified random sampling

multistage sample

We divide the class into two groups: first year students and others. We then take random samples from each group. This is an example of a. multistage sampling b. simple random sampling c. systematic sampling d. cluster sampling e. stratified random sampling

stratified random sampling

Use sample 4-1. the sample for the survey is

the 20 people who gave the sportswriter their opinion.