uppose you try to conduct a presidential approval poll of 10,000 likely U.S. voters. You know that 24% of the voters are registered as Republican, 34% are registered as Democrat, and 40% are registered as Independent. If you are going to construct a representative sample of this population, approximately how many of the likely voters in the sample should be: a. Republican b. Democrat c. Independent d. Notice the sum of the percents is not 100. What could account for this?

Several years ago, two companies merged. One of the concerns after the merger was the increasing burden of retirement expenditures. An effort was made to encourage employees to participate in the 401(k) accounts. Nationwide, 62% of eligible workers participated in these accounts. The accompanying data table contains responses of 30 employees of the company when asked if they were currently participating in a 401(k) account. Complete parts a through d. Click the icon to view the data table. a. Determine the sample proportion of company workers who participate in 401(k) accounts. The sample proportion is (Round to three decimal places as needed.) b. Determine the sampling error if in reality the company workers have the same proportion of participants in 401(k) accounts as does the rest of the nation. The error is. (Round to three decimal places as needed.) c. Determine the probability that a sample proportion at least as large as that obtained in the sample would be obtained if the…

A movie club surveyed  250  high school students. The students were asked how often they go to the movies and whether they prefer action movies or dramas. Their responses are summarized in the following table.     Twice a monthor less Three times a monthor more Action 85 20 Drama 90 55   (a) What percentage of the students go to the movies twice a month or less? (b) What percentage of the students prefer action movies ?

The accuracy of a census report on a city in southern California was questioned by some government officials. A random sample of 1215 people living in the city was used to check the report, and the results are shown below.

An addictions researcher wants to see if male and female alcoholics differ in the type of alcohol they consume. She goes to a large alcohol detox facility, gets a sample of men and a sample of women, and checks each person's chart to find the beverage of choice. She classifies the beverages as (a) wine, (b) beer, or (c) hard liquor. She then figures out how many people of this sample of 66 people fall into each category. What type of test should she perform? Answer Choices: 2-way ANOVA   chi-square test of independence   correlation   chi-square goodness of fit   Imagine an elementary school teacher who is a follower of Carl Rogers and believes that unconditional positive regard leads to psychological health and positive behaviors. He obtains a random sample of 40 children from other teachers' classrooms at his school and, through home observation, he categorizes each child as receiving unconditional positive regard frequently, sometimes, or rarely. He then has each…

In a school survey, students showed these preferences for instructional materials. Answer the question. About how many students would you expect to prefer written materials in a school of 700 students? a. about 252 students b. about 9 students c. about 126 students d. about 63 students

In an election, the population consists of the people who voted. Although there is overall data on how the population voted, there is no population data on how specific individuals voted. Exit polls are small surveys that use random sampling to ask voters questions immediately after they have voted. CNN conducted an exit poll in Texas after the 2016 presidential election. They asked a variety of questions, including whom the person voted for and their age. One age group of interest was 40–49 years. Although the proportion, ?, of voters ages 40–49 who voted for Donald Trump is not known, it does exist. Assume for this exercise that ?=0.540. Also assume that the exit poll consisted of 565 voters ages 40–49. Determine the value of ? such that in 99% of all samples of size 565, the proportion of Trump voters would be within ? of the population proportion, ?=0.540.

A school has 1600 students and they are going to vote as to whether they will completely convert the school completely off fossil fuels. How many students would you have to poll to be 95% confident of the outcome within +/- 2% of the vote?

Ancestry and Region. The U.S. Census Bureau collects information on the U.S. population by ancestry and region of residence and publishes the results in American Community Survey. According to that document, 18% of the population resides in the Northeast. a. If ancestry and region of residence are not associated, what percentage of Americans of Irish ancestry would reside in the Northeast? b. There are roughly 37 million Americans of Irish ancestry. If ancestry and region of residence are not associated, how many Americans of Irish ancestry would reside in the Northeast? c. There are, in fact, 9.25 million Americans of Irish ancestry who reside in the Northeast. Given this information and your answer to part (b), what can you conclude?

In a recent poll, 360 people were asked if they preferred cats or dogs. 49% said they preferred dogs and 51% of people said they preferred cats, with a margin of error of 2%. Which statement is true? A. In general, people prefer dogs. B. The number of people that prefer dogs is between 47% and 51%, and the number of people that prefer cats is between 49% and 53% C. In general, people prefer cats.