Determine the minimum sample size required when you want to be 90% confident that the sample mean is within one unit of the population mean and o = 14.8. Assume the population is normally distributed.A 90% confidence level requires a sample size of(Round up to the nearest whole number as needed.)O Time Remaining: 01:27:05StatcrunchMacBook AirDII08F3escF2@#8912345Y

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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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Find the critical value to for the confidence level c = 0.95 and sample size n = 28. to 11 Click the icon to view the t-distribution table. (Round to the nearest thousandth as needed.) ***
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Determine the minimum sample size required when you want to be 99% confident that the sample mean is within one unit of the population mean and σ=15.8. Assume the population is normally distributed. A 99% confidence level requires a sample size of _________
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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…
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Determine the minimum sample size required when you want to be 90% confident that the sample mean is within one unit of the population mean and σ=18.9. Assume the population is normally distributed. A 90% confidence level requires a sample size of _____________.
Determine whether the following statements are True or False: If we increase the confidence level C, then the width of the CI decreases, i.e., the CI becomes narrower. (Hint: think about what happens to the margin of error m) Suppose the mean of a population µ = 100. If we found that the margin of error is m = 2 for level of confidence 98%, then we can be 98% confident that a sample mean (computed from a sample of the same size used to compute m) is in the interval (98, 102).

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