A manufacturer claims that the average tensile strength of thread A exceeds the average tensile strength of thread B by at least 9 kilograms. Researchers wish to test this claim using a 0.05 levelof significance. How large should the samples be if the power of the test is to be 0.99 when the true difference between thread types A and B is 7 kilograms? The population standard deviation forthread A is 6.24 kilograms and the population standard deviation for thread B is 5.52 kilograms.

The given values are:Claimed difference in tensile strength (D) = 9 kgTrue difference in tensile…

Answered: A manufacturer claims that the average…

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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In the 1800s, German physician Carl Reinhold, took millions of axillary (i.e. armpit) temperatures from soldiers. This study established that body temperature is normally distributed and the standard normal human body temperature is 98.6°F with a standard deviation of 0.72 °F. In a recent study, American researchers obtained 5,000 axillary temperatures from a Los Angeles hospital. The mean of these temperature readings was 97.9 F. Assuming a Type I error risk of no more than 5%, did the findings support the theory that human, body temperature has decreased since the 1800s? What is the Zcrit?

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