You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of theintervals.From a random sample of 47 business days, the mean closing price of a certain stock was $111.62. Assume the population standard deviation is $11.42.The 90% confidence interval is (.).(Round to two decimal places as needed.) Find the minimum sample size n needed to estimate u for the given values of c, o, and E.c=0.95, o=7.8, and E = 1Assume that a preliminary sample has at least 30 members.n= (Round up to the nearest whole number.)

(a) n=47, sample mean=111.62(b) c=0.95, E=1, population standard deviations=7.8

Answered: You are given the sample mean and the…

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 are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals. A random sample of 40 home theater systems has a mean price of $130.00. Assume the population standard deviation is $18.50. The 90% confidence interval is ( 125.19), 134.81). (Round to two decimal places as needed.) Construct a 95% confidence interval for the population mean. The 95% confidence interval is ( 124.27 , 135.73). (Round to two decimal places as needed.) Interpret the results. Choose the correct answer below. O A. With 90% confidence, it can be said that the population mean price lies in the first interval. With 95% confidence, it can be said that the population mean price lies in the second interval. The 95% confidence interval is narrower than the 90%. O B. With 90%…

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