A manufacturing company produces electrical insulators. If the insulators break when in use, a short circuit is

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A manufacturing company produces electrical insulators. If the insulators break when in use, a short circuit is likely to occur. To test the strength of the insulators, destructive testing is carried out to determine how much force is required to break the insulators. Force is measured by observing the number of pounds of force applied to the insulator before it breaks. The following data (stored in Force) are from 30 insulators subjected to this testing:
A manufacturing company produces electrical insulators. If the insulators break

a. At the 0.05 level of significance, is there evidence that the population mean force is greater than 1,500 pounds?
b. What assumption about the population distribution is needed in order to conduct the t test in (a)?
c. Construct a histogram, boxplot, or normal probability plot to evaluate the assumption made in (b).
d. Do you think that the assumption needed in order to conduct the t test in (a) is valid? Explain.

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...
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Basic Business Statistics Concepts And Applications

ISBN: 9780132168380

12th Edition

Authors: Mark L. Berenson, David M. Levine, Timothy C. Krehbiel

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