The piston diameter of a certain hand pump is 0.8 inch. The manager determines that the diameters are normally distributed, with a mean of 0.8 inch and a standarddeviation of 0.004 inch. After recalibrating the production machine, the manager randomly selects 29 pistons and determines that the standard deviation is 0.0035 inch.Is there significant evidence for the manager to conclude that the standard deviation has decreased at the a=0.10 level of significance?What are the correct hypotheses for this test?The null hypothesis is Ho:The alternative hypothesis is H,:Calculate the value of the test statistic.x= (Round to three decimal places as needed.)Use technology to determine the P-value for the test statistic.The P-value is.(Round to three decimal places as needed.)What is the correct conclusion at the a= 0.10 level of significance?Since the P-value isthan the level of significance,V the null hypothesis. ThereV sufficient evidence to conclude that the standarddeviation has decreased at the 0.10 level of significance.O Time Remaining: 01:03:22Next

Answered: Image /qna-images/answer/d0f9e0da-fa84-48c5-ac0e-1574c0a2278f.jpg

Answered: Kahd pump is 0.8 inch. The manager…

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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An engineer designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such that it would produce a mean pressure of 7.8 pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on 24 engines and the mean pressure was 8.0 pounds/square inch with a standard deviation of 0.7. A level of significance of 0.05 will be used. Assume the population distribution is approximately normal. Determine the decision rule for rejecting the null hypothesis. Round your answer to three decimal places.
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During the busy season, it is important for the shipping manager at ShipMundo to be able to estimate the time it takes the loading crew to load a truck. The shipping manager has found that she can model the load times using a normal distribution with a mean of 152 minutes and a standard deviation of 15 minutes. Use this table or the ALEKS calculator to find the percentage of load times between 116 minutes and 149 minutes according to the model. For your intermediate computations, use four or more decimal places. Give your final answer to two decimal places (for example 98.23%).
An engineer designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such that it would produce a mean pressure of 4.3 pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on 26 engines and the mean pressure was 4.7 pounds/square inch with a standard deviation of 0.8. A level of significance of 0.01 will be used. Assume the population distribution is approximately normal. Find the value of the test statistic. Round your answer to three decimal places.

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