A manufacturer of electric batteries claims that the average capacity of a certain type ofbattery that the company produces is at least 140 ampere-hours with a standard deviation of 2.66ampere-hours. An independent sample of 20 batteries gave a mean of 138.47 ampere-hours. Test at 5percent significance level the null hypothesis that the mean life is 140 ampere-hours against alternativethat it is lower. Can the manufacturer's claim be sustained on the basis of this sample?

Answered: Image /qna-images/answer/3601a6a9-5968-474a-a854-85bed07c7cd4.jpg

Answered: A manufacturer of electric batteries…

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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Similar questions

The mean height of 50 Male students who showed above-average participation in college athletics was 68.2 inches with a sd of 2.5 inches, while 50 students who showed no interest in such participation had a mean height of 67.5 inches with a standard deviation of 2.8 inches. Test the hypothesis that male students who participate in college athletics are taller than other male students at 0.1 level of significance.
A random sample of 50 bags of blue corn tortilla chips had a mean weight of 9.06 ounces, with a standard deviation of 0.05 ounces. A random sample of 50 jalapeno tortilla chips had a mean weight of 9.01 ounces, with a standard deviation of 0.03 ounces. At the 0.05 level of significance, test the claim that the mean fill of blue corn tortilla chip bags is the same as the mean fill of jalapeno tortilla chips.
The General Electric Company claims that the life of LED light bulbs are has a mean life of 500 hours with the standard deviation of 50 hours. Test the claim of the manufacture if a random sample of 80 LED light tested and found out to be 450 hours only. Use 5% level of significance.
A company claims that, the mean battery life of their cell phone is at least 5 hours and standard deviation of 0.5 hour. You inspect this claim and find that a random sample of 25 cell phone has a mean battery life of 4.8 hours.Is there enough evidence to reject the claim ate the level of significance a = 0.04?
The mean body mass of 50 male students who showed above average participation in college athletics was 68.2 kg with a standard deviation of 2.5 kg, while 50 male students who showed no interest in such participation had a mean mass of 67.5 kg with a standard deviation of 2.8 kg. Test the hypothesis that male students who participate in college athletics are more massive than other male students, at 0.01 level of significance.
A light bulb manufacturer regularly advertises that his bulbs last 900 hours with a standard deviation of 75 hours. A random sample is chosen before each campaign to make sure that the claim is correct. If one such sample of 20 bulbs shows a mean of 925 hours, can the advertising claim be considered an underestimate at the 0.05 level of significance?
A random sample of 64 bags of white cheddar popcorn weighed, on average, 5.44 ounces with a standard deviation of 0.22 ounce. Test the hypothesis that μ=5.5 ounces against the alternative hypothesis, μ<5.5 ounces, at the 0.10 level of significance.

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