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Chapter 8: Q.1.2 (page 476)

Interpret the confidence level.

Short Answer

Expert verified

If the sampling procedure is repeated n number of times than 95% of the computed confidence interval are expected to contain the standard deviation of population.

Step by step solution

01

Given Information

Confidence interval =(2.84,7.55).

Number of dogs (n)=10.

Confidence level=95%.

02

Explanation

If the sampling procedure is repeated nnumber of times than 95%of the computed confidence interval are expected to contain the standard deviation of population.

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Most popular questions from this chapter

Critical value What critical value t*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 . What advantage does the more accurate df provide?

The body mass index (BMI) of all American young women is believed to follow a Normal distribution with a standard deviation of about 7.5. How large a sample would be needed to estimate the mean BMI M in this population to within 卤1vwith 99% confidence? Show your work.

56. The SAT again High school students who take the SAT Math exam a second time generally score higher than on their first try. Past data suggest that the score increase has a standard deviation of about 50 points.
How large a sample of high school students would be needed to estimate the mean change in SAT score to within 2 points with 95% confidence? Show your work.

58. Critical values What critical value t* from TableB should be used for a confidence interval for the population mean in each of the following situations?
(a) A 90%confidence interval based on n  n=12 observations.
(b) A 95%confidence interval from an SRS of30observations.

1. In the company鈥檚 prior-year survey, 80% of customers surveyed said they were 鈥渟atisfied鈥� or 鈥渧ery satisfied.鈥� Using this value as a guess for p藛, find the sample size needed for a margin of error of 3% at a 95% confidence level.

What if the company president demands 99% confidence instead? Determine how this would affect your answer to Question 1.
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