In a sample of 3,200 registered voters, 1,440, or 45%, approve of the way the President is doing his job. The 45% approval is an example ofGroup of answer choicespopulationsampledescriptive statisticsstatistical inference

A political polling agency wants to take a random sample of registered voters and ask whether or not they will vote for a certain candidate. One plan is to select 400 voters, another plan is to select 1,600 voters.If the study were conducted repeatedly (selecting different samples of people each time), which one of the following would be true regarding the resulting sample proportions of "yes" responses? Different sample proportions would result each time, but for sample size 400 they would be centered (have their mean) at the true population proportion, whereas for sample size 1,600 they would not. Different sample proportions would result each time, but for either sample size, they would be centered (have their mean) at the true population proportion. Different sample proportions would result each time, but for sample size 1,600 they would be centered (have their mean) at the true population proportion, whereas for sample size 400 they would not. For either sample size, using the same size each time, as long as the samples are drawn with replacement, they would be centered (have a mean) at 0.

A political polling agency wants to take a random sample of registered voters and ask whether or not they will vote for a certain candidate. One plan is to select 400 voters, another plan is select 1,600 voters.Which of the following is true regarding the sample proportion p̂ of "yes" responses?Group of answer choicesThe sample proportion in either proposal is equally likely to be close to the true population proportion, p, since the sampling is random.The sample proportion from sample of 1,600 is more likely to be close to the true population proportion, p.The sample proportion from the sample of 400 is more likely to be close to the true population proportion, p.

Characteristics of a population or sample are called…Group of answer choicesparametersvariablesestimatesstatistics

Every four years, when it is time to elect a new president, we pay much attention to surveys, which we usually call “polls.” Political pollsters typically ask approximately one thousand people, of the 300 million people in the United States, who they plan to vote for. They use that information to predict how the election will turn out. Who is the sample for a presidential poll?Group of answer choicesevery person who is planning on votingevery Americanpeople who have strong political opinionsthe 1,000 people asked whom they will vote for

A confidence interval is used to estimateGroup of answer choicesthe shape of the population's distributionthe sampling distributiona sample statistica population parameter