Students at a certain college were asked if they have a car. After surveying 823 students, it was found that 39% of them have a car. The margin of error was 3.4% with a 95% confidence level. What does this margin of error tell you about the percentage of students at that college who have a car? We can be 95% confident that somewhere between % and % of the students at that college have a car.

Your statistics instructor claims that 60 percent of the students who take her Elementary Statistics class go through life feeling more enriched. For some reason that she can't quite figure out, most people don't believe her. You decide to check this out on your own. You randomly survey 64 of her past Elementary Statistics students and find that 34 feel more enriched as a result of her class. Construct a 95% confidence interval for the true mean or proportion. Round to the nearest hundredth (2 decimal places). (  ,  )

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Through polling, it was estimated that the percent of people who will vote for a particular candidate in an upcoming election is 36.2%. If the margin of error is 3.5, give the confidence interval for the percentage of people who will vote for the candidate in the upcoming election.% to %

24. Job Interviews In a Harris poll of 514 human resource professionals, 90% said that the appearance of a job applicant is most important for a good first impression. a. Among the 514 human resource professionals who were surveyed, how many of them said that the appearance of a job applicant is most important for a good first impression? b. Construct a 99% confidence interval estimate of the proportion of all human resource professionals believing that the appearance of a job applicant is most important for a good first impression. c. Repeat part (b) using a confidence level of 80%. d. Compare the confidence intervals from parts (b) and (c) and identify the interval that is wider. Why is it wider?

If n=17, x bar = 39, and s=8, find the margin of error at a 99% confidence level.  Give the answer to two decimal places.

Thelma and Louise are each attempting to estimate the proportion of adults who enjoy listening to country music. They each survey a different random sample of adults, and in each sample, the proportion who say they enjoy listening to country music is 0.29. Thelma and Louise each use their sample data to construct a confidence interval. Thelma's interval is from 0.242 to 0.338 and Louise's interval is from 0.237 to 0.323. One of these intervals was computed correctly and the other was not. Which interval must be the correct one? It's impossible to answer this question without knowing the level of confidence used for each interval. It's impossible to answer this question without knowing the sample sizes. O It's impossible to answer this question without knowing the sample sizes or the level of confidence used for each interval. Thelma's interval must be the correct interval. O Louise's interval must be the correct interval.

A newspaper reported on the topics that teenagers most want to discuss with their parents. The findings, the results of a poll, showed that 41% would like more discussion about the family's financial situation, 11% would like to talk about school, and 43% would like to talk about religion. These and other percentages were based on a national sampling of 393 teenagers.  Write the margin of error for a 90% confidence interval that estimates the proportion of all teenagers who want more family discussions about school.  Round to the nearest thousandth.

You want to create a confidence interval for the difference in the percent of people over 40 who took music lessons as children and the percent of people 20-40 who took music lessons as children.  You decide to use the Plus Four method.  You ask 30 people over 40 and find that 21 of them took music lessons as children.   You ask 25 people 20-40 and find that 13 took music lessons as children. Fill in the blanks for what you would put into your calculator's interval function.  Have people over 40 be group 1.   X1 = n1 = X2 = n2 =

A. Suppose we wish to make an estimate of the proportion of the population that has ever been arrested.  We take a random sample of 500 people. In this sample, 10% of the respondents report having ever been arrested.   Construct a 95% confidence interval for the proportion of people in the population who have been arrested.   2. Interpret, in words, the meaning of this interval.