Jamestown Steel Company manufacturesand assembles desks and other office equip-ment at several plants in western New Yorkstate. The weekly production of the ModelA325 desk at the Fredonia Plant follows anormal probability distribution with a mean of200 and a standard deviation of 16. Recently,because of market expansion, new produc-tion methods have been introduced and newemployees hired. The vice president of man-ufacturing would like to investigate whetherthere has been a change in the weekly production of the Model A325 desk. Is themean number of desks produced at the Fredonia Plant different from 200 at the.01 significance level?Assuming you picked a sample of 50 desks andcomputed a sample mean of 203.50, you are nowstarting to perform hypothesis testing.1. State the null hypothesis and the alternativehypothesis.2. What should be used as test statistic? Give theformula for the test statistic.3. State the decision rule. (example: Reject the nullhypothesis if the...)4. Determine the value of the test statistic.5. What is your decision regardinghypothesis?the null6. Interpret, in a single sentence, the result of thestatistical test.

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Answered: 1. State the null hypothesis and the…

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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The next seven questions refer to the following scenario: A random sample of 16 Porsche drivers yielded an average age of 50 years with a variance of 9 years and a random sample of also 16 Ferrari drivers yielded an average of 47 years with a variance of 25 years. Porsche Driver Ferrari Driver n 16 16 mean 50 47 Variance 25 Conduct the following hypothesis test at a=0.05. HO: Mean Age Porsche Drivers Mean Age Ferrari Drivers Assume unequal variance.
What is the power of a test? Select all that apply. a.The probability that a significance test will pick up on the fact that the true value is different from the null. b.The probability of incorrectly rejecting the null when it's true. c.The probability of incorrectly failing to reject the null when it's false. d.The probability of correctly rejecting the null when the null is false. e.The probability of avoiding a type 2 error
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Explain the difference between statistical significance and practical significance. Choose the correct answer below. O A. Statistical significance means that the sample statistic is not likely to come from the population whose parameter is stated in the null hypothesis. Practical significance refers to whether the difference between the sample statistic and the parameter stated in the null hypothesis is large enough to be considered important in an application. O B. Statistical significance refers to how an unusual event is unlikely to actually appear in a real world application, such as every entry in a sample of size 50 having the same value. Practical significance refers to how an unusual event is likely to actually appear in a real world application, such as a rejection of a null hypothesis using data that looks feasible. O C. Statistical significance refers to the type of hypothesis test needed to analyze a population, with some tests being more important than Z tests. Practical…
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Hypothesis Testing Review For each problem below, simply identify the null and alternative hypotheses. Use appropriate notation/symbols. You do not have to run any hypothesis tests, although it's good practice and I'll post answers for all of them. 1) A simple random sample of 44 men from a normally distributed population results in a standard deviation of 10.7 beats per minute. The normal range of pulse rates of adults is typically given as 60 to 100 beats per minute. If the range rule of thumb is applied to that normal range, the result is a standard deviation of 10 beats per minute. Use the sample results with a 0.10 significance level to test the claim that pulse rates of men have a standard deviation equal to 10 beats per minute. 2) In 1997, a survey of 880 households showed that 145 of them use e-mail. Use those sample results to test the claim that more than 15% of households use e-mail. Use a 0.05 significance level.
d) Write a conclusion based on the results. Choose the correct answer below.Pick one of the bolded words below. Reject/Do not reject the null hypothesis and claim that there is/is not sufficient evidence to conclude that the population mean is greater/less than 23
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Using the question above. 1. What are the null and alternative hypothesis B. Find the test statistic, z0 C. Find the p-value

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