A machine cuts plastic into sheets that are 50 feet (or 600 inches) long. Assume that the populationof lengths is normally distributed with a population standard deviation of 0.4 inch. The companywants to estimate the mean length the machine is cutting the plastic to be within 0.038 inch. Howmany plastic sheets must the company sample in order to construct a 99% confidence interval forthe population mean length?n=Do not round mid-calculation. However, use a critical value accurate to three decimal places. Roundyour final answer up to the next nearest whole number.

given data normal distributionσ = 0.4E = 0.03899% ci for μ.n = ?

Answered: A machine cuts plastic into sheets that…

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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The mean IQ score of adults is 100, with a standard deviation of 15. Use the empirical rule to find the percentage of adults with scores between 70 and 130. (Assume the data set has a bell-shaped distribution.)
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You want to estimate the mean weight of quarters in circulation. A sample of 50 quarters has a mean weight of 5.658 grams and a standard deviation of 0.064 gram. Use a single value to estimate the mean weight of all quarters. Also, find the 95% confidence interval for the average weight of all quarters. grams. The estimate for the mean weight of all quarters is (Round to three decimal places as needed.) Find the 95% confidence interval for the mean weight of all quarters. grams<μ< grams (Round to three decimal places as needed.)
a sugar company packages sugar in 5kg bags. the amount of sugar per bag varies according to a normal distribution. a sample of 25 bags is selected from the days production and the mean for the day is 4.98 kg and the standard deviation is 0.05 kg. ( use 1-a= 0.95 ) the margin of error for the amount of sugar is?
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