what is a 90% confidence interval for the population mean if the sample mean is 20, the sample size is 100 and the standarddeviation is 9.8. You should use the fact that 90% of sample means are within 1.66 standard errors of the population meana. none of the other options is correctO b. between 18.373200 and 21.626800O c. between 18.373200 and 27.126800O d. between 12.873200 and 21.626800

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Answered: what is a 90% confidence interval for…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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You measure the lifetime of a random sample of 64 tires of a certain brand. The sample mean is = 50 months. Suppose that the lifetimes for tires of this brand follow a Normal distribution, with unknown mean and standard deviation = 3.79 months A 99% confidence interval for is: a. 40.2 to 59.8. b. 48.39 to 51.61. c. 48.78 to 51.22. d. 49.8 to 50.2.
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Please note that answer 1537 was incorrect.
possible In a random sample of twelve people, the mean driving distance to work was 18.9 miles and the standard deviation was 6.3 miles. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 95% confidence interval for the population mean u. Interpret the results. Identify the margin of error. (Round to one decimal place as needed.) Construct a 95% confidence interval for the population mean. (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) O A. It can be said that % of the population has a driving distance to work (in miles) that is hetween the interval's endpoints li
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