Res 342 Week 3

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| C. No, because the test value 1.257 is greater than the critical value 1.115

The critical value for significance level α=0.05 for an upper-tailed z-test is given as 1.645.

46. As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants 14 failed the test. Develop a 99 percent confidence interval for the proportion of applicants that fail the test. Would it be reasonable to conclude that more than 10 percent of the applicants are now failing the test? In addition to the testing of applicants, Fashion Industries randomly tests its employees throughout the year. Last year in the 400 random tests conducted, 14 employees failed the test. Would it be reasonable to conclude that less than 5 percent of the employees are not able to pass the random drug test?

Using the statistical tables in your textbook, find the values of the appropriate test statistic in the following two situations:

D) The p-value cannot be determined without specifyingAnswer: A18. In a left-tailed test at α = .05 we wouldA) comfortably reject the claim.

The critical value for significance level, α=0.05 for a lower-tailed z-test is given as 1.645.

So, in order to determining the number of items actually sold here is how you calculate it:

Test statistic t = -3.937 (df = 80), p-value < .005, reject Hₒ and conclude that there is a significant

Since -1.30 does not fall in the rejection region, H₀ is retained; or since p-value is larger than significance level, H₀ is retained. At the 0.05 significance level, the number of units produced on the afternoon shift is the same as number of units produced by day shift.

c) Is there a high probability that the mean and standard deviation of your sample are consistent

* This is a one tailed (upper or right since HA has “&gt;”). Our rejection regions would be z &gt; 1.645.

1. Using the data in the file named Ch. 11 Data Set 2, test the research hypothesis at the .05 level of significance that boys raise their hands in class more often than girls. Do this practice problem by hand using a calculator. What is your conclusion regarding the research hypothesis? Remember to first decide whether this is a one- or two-tailed test.

Which of the following correctly describes the 95% confidence interval for the mean based on the sample? Selected Answer: D.

A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true proportion of families who own at least one DVD player. Place your