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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A sample mean, sample size, population standard deviation, and confidence level are provided. Use this information to complete parts (a) through (c) below. x=35, n=27, σ=5 confidence level=90% a. Use the one-mean z-interval procedure to find a confidence interval for the mean of the population from which the sample was drawn. The confidence interval is from _______ to _________. (Type integers or decimals rounded to one decimal place as needed.) b. Obtain the margin of error by taking half the length of the confidence interval. What is the length of the confidence interval? ____________ (Type an integer or decimal rounded to one decimal place as needed.) c. Obtain the margin of error by using the formula E=zα2•σn. Identify the critical value. zα2=____________ (Type an integer or decimal rounded to two decimal places as needed.) What is the margin of error obtained using the methods of parts (b) and(c)? _________ (Type an integer or decimal…
Please answer within 30min thanks. n = 29 for the 90% confidence interval for the mean.
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Explain also how you use Z table ..
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