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Professor Professorson, a researcher at Greendale Community College, is interested in the effect of caffeine on the typing speed of students. Professorson obtains a random sample of 8 students who are given 400 mg of caffeine then given a typing test. They type an average of 51.4 words per minute (wpm), with a sample standard deviation of 12.3 wpm. He also obtains a random sample of 13 students who are given a placebo before the typing test. The placebo group types an average of 43.9 wpm, with a sample standard deviation of 15.1 wpm. Assume typing speeds follow a normal distribution in both groups.
(a) Construct a 99% confidence interval for μC-μP, the true difference in average typing speed between the caffeine and placebo groups. Assume that the true variances are equal.
(b) Construct a 99% confidence interval for μC-μP, the true difference in average typing speed between the caffeine and placebo groups. Do not assume that the true variances are equal.
the damon family owns a large grape vineyard in western new york along lake erie. the grapevines must be sprayed at the
1.we are interested in comparing the proportions of males and females who think earning a large salary is very
A woman makes long-distance calls with the help of her cell phone according to a Poisson process with rate λ. Suppose that for each long-distance call billed, the next call is free and that we fix the origin at the moment when a call has just been..
Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance, as described in each of the following:
What formula would I use? Can you break it down into baby steps so I can understand how you got the answer?
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a car manufacturer claims that its vehicles average at least 25 miles per gallon with a population standard deviation
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To determine whether or not they have a certain desease, 80 people are to have their blood tested. However, rather than testing each individual separately, it has been decided first to group the people in groups of 10.
Scenario: The data from a survey that your organization is using to monitor and evaluate a product launched last year indicates that many customers are dissatisfied. You call a meeting to discuss the survey data. During the meeting, one person tal..
What is the Population standard deviation of In a particular hospital, newborn babies were delivered yesterday. Here are their weights (in ounces).
A local bank reported to the federal government that its 5,246 saving accounts have a mean of $1,000 and standard deviation of $240.
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