ision Making home > 5.2: Hypothesis test for a population meanypothesis test for a population mean.ote:1295Jump to level 1A pipes manufacturer makes pipes with a length that is supposed to be 11inches. A quality control technician sampled 40 pipes and found that thesample mean length was 11.06 inches and the sample standard deviation was0.27 inches. The technician claims that the mean pipe length is not 11 inches.What type of hypothesis test should be performed? SelectWhat is the test statistic? Ex: 0.123What is the number of degrees of freedom? Ex: 20Does sufficient evidence exist at the a = 0.05 significance level to support thetechnician's claim? SelectChecktNextMESA 811012hp3

The question is about hypo. testing Given : Popl. mean length of pipe ( μ ) = 11 inches Randomly…

Answered: A pipes manufacturer makes pipes with a…

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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A city council is deciding whether or not to spend additional money to reduce the amount of traffic. The council decides that it will increase the transportation budget if the amount of waiting time for drivers exceeds 18 minutes. It decides to collect sample data a hypothesis test of the wait times. Waiting times were recorded for a sample of 26 main roads and the sample mean and standard deviation were computed. The sample statistics were used to compute a test statistic of 1.42. In the box below: (a) Give the p-value (Round to three decimal places.) (b) State whether or not the city should increase its transportation budget, at the 5% significance level. Explain briefly.
In a data set of 190 ratings, there was a mean rating of 6.82 with a standard deviation of 2.06. Use a 5% significance level to test the claim that the population mean of statute ratings is less than seven. what is the Null and alternative hypothesis, the test statistic, the P value, and the conclusion and interpretation
A researcher is planning a study of graduate students’ sleep deprivation. Assume that the population mean and standard deviation are provided, and a random sample of 25 students are drawn to participate. What statistical procedure is appropriate for conducting the study? - Z test - Independent samples t-test - Dependent samples t-test - ?
The mean length of lumber is supposed to be 8.5 feet. A builder wants to check whether the shipment of lumber she receives has the correct length, so she conducts a hypothesis test. She measures 61 randomly selected pieces of lumber and finds they have a mean of 8.3 feet and standard deviation of 0.75 feet. With the help of Mathematics & R Studio: Conduct a hypothesis test to see whether she is justified to believe that the average is shorter than 8.5 feet?
According to the College Board, scores on the math section of the SAT Reasoning college entrance test for the class of 2010 had a mean of 516 and a standard deviation of 116. Assume that they are roughly normal.One of the quartiles of the scores from the math section of the SAT Reasoning test is 438. The other quartile is _______.
???
Among private universities in the United States, the mean ratio of students to professors is 35.2 (i.e., 35.2 students for each professor) with a standard deviation of 8.8. Suppose a random sample of 50 universities is selected and the observed mean student-to-professor ratio is 38. Is there evidence that the reported mean ratio actually exceeds 35.2? Use  = 0.05 and conduct the appropriate hypothesis test. ( See attached picture )
Use the following scenario to answer the next 6 questions. An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 30 engines and the mean pressure was 4.8 psi with a standard deviation of 1 psi. If the valve was designed to produce an overall mean pressure of 5.0 psi, is there sufficient evidence at the 10% level of significance that the valve performs below specifications? The appropriate hypothesis test for this scenario is: Group of answer choices right-tailed two-tailed left-tailed
select which of the three is correct
An electrician wants to know whether batteries made by two manufacturers have significantly different voltages. The voltage of 131 batteries from each manufacturer were measured. The population standard deviations of the voltage for each manufacturer are known. The results are summarized in the following table. Manufacturer Sample mean voltage (millivolts) Population standard deviat A 116 3 115 4 What type of hypothesis test should be performed? Right-tailed z-test v What is the test statistic? Ex: 0.12 Does sufficient evidence exist to support the claim that the voltage of the batteries made by the two manufacturers is different at the a = 0.01 significance level? Select v
Good credit: The Fair Isaac Corporation (FICO) credit score is used by banks and other lenders to determine whether someone is a good credit risk. Scores range from 300 to 850 , with a score of 720 or more indicating that a person is a very good credit risk. An economist wants to determine whether the mean FICO score is more than the cutoff of 720 . She finds that a random sample of 120 people had a mean FICO score of 740 with a standard deviation of 90 . Can the economist conclude that the mean FICO score is greater than 720 ? Use the =α0.01 level of significance and the P -value method with the
An electrician wants to know whether batteries made by two manufacturers have significantly different voltages. The voltage of 50 batteries from each manufacturer were measured. The population standard deviations of the voltage for each manufacturer are known. The results are summarized in the following table. Manufacturer Sample mean voltage (millivolts) Population standard deviati A B 130 129 What type of hypothesis test should be performed? Select What is the test statistic? Ex: 0.12 1 4 Does sufficient evidence exist to support the claim that the voltage of the batteries made by the two manufacturers is different at the a = 0.05 significance level? Select

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