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Rating dorm food Latoya wants to estimate what proportion of the seniors at her high school like the cafeteria food. She interviews an SRS of 50of the 175 seniors living in the dormitory. She finds that 14 think the cafeteria food is good.

Short Answer

Expert verified

All three conditions for confidence interval is not satisfied

Step by step solution

01

Step-1 Given Information

Given in the question that,

Sample size=50

Total number of seniors=175

number of success=14we have to check whether each of the conditions is met for calculating a confidence interval for the population proportionp.

02

Step-2 Explanation

Three conditions must be met in order to construct a confidence interval. Random, Independent, and NormaL are the conditions.

Since Latoya interviewed seniors staying in the dormitory at random, the condition of randomness has been satisfied. The sample size is greater than 10%of the total number of seniors in the hostel. As a result, the 10%criterion is not met. As a result, the criteria for independence is not met. The survey's success rate is 14percent, which is higher than the national average of 10percent. As a result, the typical condition is met. As a result, none of the three confidence interval conditions are met.

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Most popular questions from this chapter

In each of the following situations, discuss whether it would be appropriate to construct a one-sample tinterval to estimate the population mean.

(a) We collect data from a random sample of adult residents in a state. Our goal is to estimate the overall percentage of adults in the state who are college graduates.

(b) The coach of a college menโ€™s basketball team records the resting heart rates of the 15team members. We use these data to construct a confidence interval for the mean resting heart rate of all male students at this college.

(c) Do teens text more than they call? To find out, an AP Statistics class at a large high school collected data on the number of text messages and calls sent or received by each of 25randomly selected students. The Fathom boxplot below displays the difference (texts calls) for each student.

What critical value tโ‹†from Table B would you use for a 90%confidence interval for the population mean based on an SRS of size 77? If possible, use technology to find a more accurate value of tโ‹†. What advantage does the more accurate df provide?

Many television viewers express doubts about the validity of certain commercials. In an attempt to answer their critics, Timex Group USA wishes to estimate the proportion of consumers who believe what is shown in Timex television commercials. Let prepresent the true proportion of consumers who believe what is shown in Timex television commercials. What is the smallest number of consumers that Timex can survey to guarantee a margin of error of 0.05or less at a 99%confidence level?

(a) 550

(b) 600

(c) 650

(d) 700

(c)750

I collect an SRS of size n from a population and compute a 95%confidence interval for the population proportion. Which of the following would produce a new confidence interval with larger width (larger margin of error) based on these same data?

(a) Use a larger confidence level.

(b) Use a smaller confidence level.

(c) Increase the sample size.

(d) Use the same confidence level, but compute the interval n times. Approximately5% of these intervals will be larger.

(e) Nothing can guarantee absolutely that you will get a larger interval. One can only say that the chance of obtaining a larger interval is 0.05.

It's about ME Explain how each of the following would affect the margin of error of a confidence interval, if all other things remained the same.

(a) Increasing the confidence level

(b) Quadrupling the sample size

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