2. Questions:CHAPTER 5: HYPOTHESIS TESTINGEU TEGENOSAn engineer claims that less than 50 solar panels produced in a batch by his company havea type of defect known as microcracks. A sample of 300 solar panels are collected with themean of 50.5 and standard deviation of 8. Answer the following questions:i. State the null and alternative hypothesis including the claim.ii. Test the hypothesis by using 0.05 significance level.

Here, sample size is 300, sample mean is 50.5 and sample standard deviation is 8.

Answered: 2. Questions: An engineer claims that…

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 CDMX, the population average of the age of pregnant women is 19 years. A sociologist believes that in the city where she lives the average is higher. For this, she selected 72 pregnant women, obtaining a mean of 20.7 years with a standard deviation of 6.3 years. We want to test the research hypothesis with a significance level of 0.05. Choose 1.The correct conclusion2.The correct interpretation Select one: 1.H0 is rejected2. With a confidence level of 95%, it can be ensured that the population mean age of pregnant women is not greater than 19 years in the city of the sociologist. 1.H0 is not rejected2. With a confidence level of 95%, it can be ensured that the population mean age of pregnant women is not greater than 19 years in the city of the sociologist. 1.H0 is not rejected2. It can be ensured, with 95% confidence, that the population mean age of pregnant women is greater than 19 years in the city of the sociologist 1.H0 is rejected2. It can be ensured, with 95% confidence, that…
3) Visions Today would like to test the hypothesis that those celebrating the Poson Festival will spend more than an average of $125 on gifts. A random sample of eighteen people celebrating the Poson Festival spent an average of $148.50 with a standard deviation of $34.90. Visions Today would like to set an alpha level of 0.01. Test this hypothesis using the critical value approach.
The cooling system in a nuclear submarine consists of an assembly of welded pipes through which a coolant is circulated. Specifications require that weld strength must exceed 150 psi. A random sample of 20 welds resulted in a sample mean of 153.7 psi and a sample standard deviation of 11.3 psi. What is the appropriate alternative hypothesis for the problem? O mean 150 O mean = 150 mean # 153.5
A textile fiber manufacturer is investigating a new drapery yam, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. The company wishes to test the hypothesis using a random sample of four specimens. Identify the appropriate hypotheses test. a. Test on Mean, Variance Known b. Test on Variance and Standard Deviation c. Test on Population Proportion d. Test on Mean, Variance Unknown
An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 140 engines and the mean pressure was 5.4 pounds/square inch (psi). Assume the population standard deviation is 1.0. If the valve was designed to produce a mean pressure of 5.6 psi, is there sufficient evidence at the 0.01 level that the valve performs below the specifications? Step 5 of 6: Identify the level of significance for the hypothesis test.
A factory that manufactures screws is performing a quality control experiment. Each object should have a length of no more than 13 centimeters. The factory believes that the length of the screws exceeds this value and measures the length of 70 screws. The sample mean screw length was 13.01 centimeters. The population standard deviation is known to be σ=0.15 centimeters. What is the null hypothesis? What is the alternative hypothesis?
Suppose we are contracted by the Justice Department to study the extent of juvenile delinquency. We take a random sample of 100 juveniles, and we find that the mean number of crimes committed is 12 with a standard deviation of 7. Test the null hypothesis that the mean number of crimes committed by the population of juveniles is less than or equal to 11. Use a significance level of .05. (Be sure to show the numeric results that lead to your decision.) Do we reject the null hypothesis here? why or why not.
a. State the Null and Alternative Hypotheses b. Choose the appropriate statistical test c. Determine the Level of Significance and the Critical Value & Solve for the computed value
An automobile manufacturer has given its van a 36.8 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this van since it is believed that the van has an incorrect manufacturer's MPG rating. After testing 160 vans, they found a mean MPG of 37.0. Assume the population standard deviation is known to be 1.5. Is there sufficient evidence at the 0.0 level to support the testing firm's claim? Step 4 of 6 : Find the P-value of the test statistic. Round your answer to four decimal places.
An electronics production sequence includes a process where a film of metal is deposited on a board. The film must be more than 1.000 mm thick. If the film is too thin the process fails. The engineer ran a test where the null hypothesis was that the mean thickness was at most 1.000 mm. A sample of 100 boards had a mean thickness of 1.007 mm and a standard deviation of 0.050 mm.At what level of significance would the null hypothesis be rejected? Express your answer at a decimal (not a percent) rounded to three places.

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