a. Is there sufficient evidence to conclude that tests differ inthe mean impurity level, using a = 0.01?b. Is there evidence to support the claim that test 1 generatesa mean difference 0.1 units lower than test 2? Use α = 0.05.c. If the mean from test 1 is 0.1 less than the mean from test2, it is important to detect this with probability at least 0.90.Was the use of eight alloys an adequate sample size? If not,how many alloys should have been used?10.4.4 .WP Two different analytical tests can be used to deter-mine the impurity level in steel alloys. Eight specimens are testedusing both procedures, and the results are shown in the followingtabulation.Specimen15675 AWN.2348Test 11.21.31.51.41.71.81.41.3Test 21.41.71.51.32.02.11.71.6

From the given data we haveSpecimenTest 1Test…

Answered: a. Is there sufficient evidence to…

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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Q9. A Random Variable X has an unknown distribution, a known mean of 10 and an unknown variance, oʻ. To test a claim that the distribution is no longer 10, a random sample of 100 of X was collected which gave a sample mean, x of 9.8 and a sample variance, s? = 16. Working at the 5% Significance level what is the reject region? A. z 1.96 2 %3D B. z>-1.96 AND z 2.57 D. z 1.96 О А. А О В. В О С. С O D. D
Which of the following statements concerning internal reliability is correct? A. When reliability approaches 1, you shoukd become concerned B.When cronbacch's alpha is .65, 35% of the observed score is a measurement error
Consider Y has a normal distribution with mean 52.64 and standard deviation 5.19. For each of the following parts use the tables for the standard normal distribution provided in the textbook, and verify your answers using R. a) What is the probability Y is greater than 46.3? b) What is the probability that Y is between 47.9 and 55.8? c) What is the probability Y is less than 60.0 given that it is greater than 40.0?
Use the following table to determine whether or not there is a significant difference between the average hourly wages at two manufacturing companies. Assume a level of significance of 0.05. Manufacturer 1 Manufacturer 2 n1 = 82 n2 = 65 x⎯⎯1=$16.80x¯1=$16.80 x⎯⎯2=$16.00x¯2=$16.00 σ1 = $3.00 σ2 = $2.25 What is the test statistic for the difference between the means? Multiple Choice 1.973 1.990 1.300 1.847
Some research indicates that successful deliveries are those that do not exceed forty minutes. It is known that these deliveries are normally distributed. Selecting a sample of forty two customers the researcher wants to test if the mean delivery time will actually exceed forty minutes. Suppose the p-value for the test was found to be 0.0281. State the correct conclusion based on each significance level. a. At α = 0.03, we do not reject H 0. b. At α = 0.025, we do not reject H 0. c. At α = 0.02, we reject H 0. d. At α = 0.05, we do not reject H 0.
9.13 Given a sample size of 36, how large does the population standard deviation have to be in order for the standard error to be A. 1? B. 2? C. 5? D. 100?
A marketing researcher would like to compare the mean amounts that men and women spend on Christmas gifts. Independent random samples were taken from each group. He would like to conduct a test to determine if women spend more on average. If the null hypothesis is Ho : µM - µf = 0, what is the alternative hypothesis? ge 2: ge 3: OH1 : µM – HF 0 4 OH1 : µM – HF # 0 Page 5: Next Page Dege 10of15
10. For which of the following cases would you use a t-test statistic? A. Where the population distribution is not normal, the population variance is not known and the sample size is below 25. B. Where the population distribution is not normal but the population variance is known. C. Where the population distribution is normal, the population variance is not known and the sample size is below 25. D. Where the population distribution is normal, the population variance is known and the sample size is 25 or more.
If the t-statistic for a single sample t-test is 1.58, what can you conclude? a. The test is significant at an alpha level of .05. b. The sample size of the test was at least 30. c. The sample mean was larger than the population mean. d. The population standard deviation was smaller than the difference between the sample mean and the population mean.

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