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A company manufactures metal tubes for the aerospace industry. The company has two workers (Joe and Sam) who measure the final products to ensure that they are the correct length. The company manager wants to determine if there is a significant difference in the measurements made by these two individuals. He has each of them measure the same set of 15 tubes. Assume that the differences are calculated as Joe - Sam.
Select all of the correct null and alternative hypotheses.
One advantage of the repeated measures ANOVA is that it eliminates "individual differences" as a source of variability. Explain why there are no individual differences in the numerator and in the denominator of the F ratio.
a market research company interviews a simple random sample of 3600 persons in a certain town and asks what they did
suppose that customers at a telephone company receive busy signals 4 of the time. one week a customer calls 25 times.
A study with 14 subjects reported a result that failed to achieve statistical signi?cance at the 5% level. The P-value was 0.052. Write a short summary of how you would interpret these ?ndings.
Refer to Exercise, including the information given in part (c). Which of the given could be specified before the samples are taken? Explain.
Construct a 98% jackknife con?dence interval for the mean change in heart rate. Interpret your answer.
1. at a certain high school a random sample of 50 student are chosen for a free 10-week sat prep class they are given a
Let R be a σ-ring of subsets of a set X . Let S be the σ-algebra generated by R. Recall (§3.3, Problem 8) or prove that S consists of all sets in R and all complements of sets in R.
It is often stated in three-shift manufacturing organizations that the quality of work on the second shift is worse than on the first, and that the quality of work on the third shift is worst of all. How would you go about testing that premise?
a small gasoline station next to an interstate highway is open for 24 hours per day and has one pump and room for two
In 74 of these samples, they detected DDTs with concentration levels up to 840 ng g-1 dw. Obtain a 95% con?dence interval for the proportion of total number of sediments with detectable DDTs.
Jen's dog broke off her six-inch-long pencil at a random point on the pencil. Find the density function and the expected value of the ratio of the lengths of the shorter piece and the longer piece of the pencil.
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