Question 3. To determine whether the pipe welds in a nuclear power plant meet specifica-tions, n = 25 welds are randomly selected. The specifications state that mean strength ofwelds should exceed 120 lb/in². Test the following hypothesis against its alternative at thesignificance level a = 0.05::Ho: μ = 120, Ha > 120.₁₁From the sample, it is given thatdistribution table.=3050 and ₁²= 372964. Use the t-

To determine whether the pipe welds in a nuclear power plant meet specifications, n = 25 welds are…

Answered: welds should exceed 120 lb/in². Test…

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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Is the following statement true or false and why: If we do not reject ?0H0, then we conclude that ?1H1 is false. Washers used in a certain application are supposed to have a thickness of 2 millimeters. A quality control engineering measures the thickness for a sample of washers and tests ?0:?=2H0:μ=2 versus ?1:?≠0H1:μ≠0. If a Type I error is made, what conclusion will be drawn regarding the mean washer thickness?
b) A manufacturer claims that the average thickness of their chewing gum is 20mm. A quality control engineer wishes to check this claim and measures the average thickness of a sample of 10 pieces of gum, finding x = 18.6mm and s = 4mm. Does the sample seem to indicate that the average thickness of their chewing gum is not 20mm? Use a 0.05 level of significance. Circle the correct null and alternative hypotheses. i) H : μ = 20 : Нo μ = 20 Η : μ 20 ii) What is the probability of making a Type I error? iii) Which test statistic will you use? Circle your answer. Ꮓ T iv) x² Calculate the value of the test statistic for the quality control engineer's sample. v) Determine the critical value of the test statistic. Do not round or truncate. vi) Determine the P-value. vii) What is the conclusion? Accept Ho Reject Ho Fail to reject Ho Circle your response. viii) Does the sample seem to indicate that the average thickness of their chewing gum is not 20mm? Circle your response. YES NO
In general, when people diet they typically lose 10 lbs. (?σ = 2). A random sample of 16 people on the keto diet lost 15 lbs. Do people on the keto diet lose more or less weight than people on diets in general? 6. What is the critical value for this test? a) +/- 1.96 b) -1.96 c) 1.96 d) None of the above
In a National Public Transportation survey conducted in 1995 on the modes of transportation used to commute to work, 79.6% of the respondents said they drive alone, 11.1% carpool, 5.1% use public transportation, and 4.2% depend on other modes of transportation (USA Today, April 14, 1999). Assume that these percentages hold true for the 1995 population of all commuting workers. Recently 1000 randomly selected workers were asked what mode of transportation they use to commute to work. The following table lists the results of this survey (observed counts): Mode of transportation Number of workers Сагроol 102 Public Transportation Drive Alone Other 812 57 29 Test at the 2.5% significance level whether the current pattern of use of transportation modes is different from that for 1995. 1. State the null and alternate hypothesis. Но: HA: 2. Select the distribution to use. 3. Determine the rejection region. 4. Determine the degrees of freedom. df = k - 1 5. Create a table of expected counts.…
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A city claims that the mean number of public transportation users per day is at least 4,800. A group of researchers think this is not accurate and want to show that the number of public transportation users is less than 4,800 Identify the null hypothesis, Ho, and the alternative hypothesis, Ha , in terms of the parameter μ. Select the correct answer below: O Ho: μ 4,800; Ha: u K 4,800 Ho: μ 4,800; Ha: μ > 4,800 Ho: μ 24,800; Ha : μ < 4,800 O O
With α=0.05, test the claim that blood pressure is the same in the right and left arms from the following data: right 116 113 120 135 143 left 105 115 123 138 139 a) Show your hypothesis test including your set-up, what you got from the calculator. b) Identify the conclusion.
Statistics practice B? A paint manufacturer advertises that one gallon of its paint will cover sq ft ofinterior wall. Some local painters suspect the average coverage is considerableless and decide to conduct an experiment to find out. If µ represents the trueaverage number of square feet covered by the paint, which of the following arethe correct null and alternative hypothesis to be tested?A) H0: µ =400, Ha: µ > 400B) H0: µ >400, Ha: µ > 400C) H0: µ =400, Ha: µ ≠ 400D) H0: µ ≠400, Ha: µ < 400E) H0: µ =400, Ha: µ < 400
Can someone help with the assumptions and the conclusion/interpretations?
I need help answering 26. (a-e)
Construct the indicated confidence interval for the population mean μ using the t-distribution. Assume the population is normally distributed. c=0.90, x=14.5, s=4.0, n=5 (,) (Round to one decimal place as needed.)

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welds should exceed 120 lb/in². Test the following hypothesis against its alternative at the significance level a = 0.05: 120, Ha > 120. Ho: