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A professor has a teaching assistant record the amount of time (in minutes) that a sample of 16 students engaged in an active discussion. The assistant observed 8 students in a class who used a slide show presentation and 8 students in a class who did not use a slide show presentation.
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14 68 184 239 1519 1012 115 217 13
Use the normal approximation for the Mann-Whitney U test to analyze the data above. (Round your answer to two decimal places.)
z = ___________
State whether to retain or reject the null hypothesis. (Assume alpha equal to 0.05.)
Retain the null hypothesis.
Reject the null hypothesis.
Suppose that the true mean is .25 standard deviations away from the null hypothesis mean. You want to to find .05 significance level two-tailed test
What standard deviation minimizes the annual cost of producing elevator rails?- one elevator rail in 1000 will be at least how many inches in diameter?
b. Show and interpret a 90% confidence interval for the mean daily rainfall.
Using the formula, Elk]:'u: 2? , what would be the expected or theoretical value for the mean of the sampling distribution of the mean? How does it compare to t
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.
Write down the name of 4 parts of the regression equation.
Determine that your peer's response reveals errors in thinking or understanding the readings or concepts. Discuss these by pointing to the correct information in the literature
A national chain of health clubs says the mean amount of weight lost by members during the past month was at least 5 pounds. Skeptical of this claim, a consumer advocate believes the chain's assertion is an exaggeration.
Conduct the six steps of hypothesis testing for this example. (Note: Be sure to use the correct proportions for the expected values)
Calculate control limits for an S chart from the refractive index data of Exercise 11. Does the process appear to be in control with respect to variability? Why or why not?
a researcher measures how positive a persons mood is and how creative he or sheis obtaining the following interval
Calculate Fiam's expected profit. Round your answer to one decimal.
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