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You notice at the gym that it appears more women tend to work out together, whereas more men tend to work out alone. To determine whether this difference is significant, you collect data on the workout preferences for a sample of men and women at your gym. The data follows.
Males FemalesTogether 5 8Alone 7 6
a. What statistical test should be used to analyze the data?b. Identify H0 and Ha for this studyc. Conduct the appropriate analysis.d. Should H0 be rejected? What should the researcher conclude?
Construct a 90% confidence interval on the difference in fraction nonconforming between the two processes."
The grades of 20 students are listed in the stem and leaf diagram below. What is the probability of randomly selected student to have a grade more than or equal to 60 and less than or equal to 80.
The height in inches of girls on a high school girls basketball team are as follows: Identify the z score used in a quantile plot for the player with a height of 66.5 inches.
Compute the proper measure of association of smoking and lung cancer.
Two chi-square distributions were plotted on the same chart. One distribution was for 3 degrees of freedom and the other was for 12 degrees of freedom. Which distribution would tend to approach a normal distribution?
In which category is ANOVA properly classified?
Plot the market-share data. (b) Describe the trend (if any) and discuss possible causes. (c) Fit three trends (linear, exponential, quadratic).
Give a 99% confidence interval for the rating of the table that would be given by an average member of the population of regular customers. Assume normality.
An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a standard deviation of $78.11.
Suppose that you wish to test the effect of lowering the soil ph on the number of lady ferns in an area. The researchers hypothesize that lowering the ph-level of the soil will lead to more ferns.
Write a one-page report to Ms. Gupta presenting your conclusions regarding the market performance of Brand 1.
The Starbucks in the Bauer College of Business found that 24% of customers purchase more than one cup of coffee per day from their shop. If 180 customers are randomly selected one day, what is the probability that no less than 25% of them purchase..
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