During the 2009 holiday season, 436 randomly sampled American adults were surveyed regarding their average spending on Black Friday. A 95% confidence interval based on this sample is ($80.31,$89.11).(c) Determine the sample mean x and the sample standard deviation s of the sample.(d) Which would be the confidence level corresponding to an interval ($81.27,$88.15) for the data found in (c)?(e) If the values of the sample mean and sample standard deviation found in (c) do not change, find the sample size N for which a 99% confidence interval would have a margin of error smaller than 5.

c) The sample mean is 84.71 and it is calculated below: From the given information, the 95%…

Answered: During the 2009 holiday season, 436…

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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During the 2009 holiday season, 436 randomly sampled American adults were surveyed regarding their average spending on Black Friday. A 95% confidence interval based on this sample is ($80.31,$89.11).

(d) Which would be the confidence level corresponding to an interval ($81.27,$88.15) for the data found in (c)?

(e) If the values of the sample mean and sample standard deviation found in (c) do not change, find the sample size N for which a 99% confidence interval would have a margin of error smaller than 5.

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