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Dr. Alexander is interested in studying the effects of exercise on mood. Participants included 120 children, half assigned to swim 30 minutes per day and the other half assigned to read 30 minutes per day. After 3 weeks, they administered a test of positive mood. If this study involved a repeated measures design (within subjects) comparing conditions with the same number of participants, how many participants would be in each group?
Suppose today's sample yielded a mean of $4.19 and a standard deviation of $0.10, create and interpret a 99% confidence interval for the population standard deviation. Assume the distribution of gas prices in the area follows a normal distribution..
Show the sampling distribution of line over x where line over x is the sample mean annual cost of automobile insurance.
Graphical method to solveout the linear programming problem. Describe where the following TEO constraints intersect.
Provide an example of an application of the normal distribution. Explain why standard normal distribution can be used to find the probabilities for all normal distributions?
The records of a casualty insurance company show that, in the past, its clients have had a mean of 1.8 auto accidents per day with a variance of 0.0016.
Setup the alternative hypothesis that will test the claim that the percentage of women preferring white wine is 25% higher than men.
A recent research report shows that the percentage of college students who have been reported for plagiarizing has reached 30% each in the colleges of Education, Arts and Sciences, and Business, but only 10% in the School of Law.
Estimated the probability that among 75 randomly selected students, at least 20 of them score greater than 78.
Demonstrate correct use of descriptive statistics. Demonstrate proficiency in hypothesis testing. Evaluate the results of a statistical analysis.
The American Bankers Association collects data on the use of credit cards, debit cards, personal checks, and cash when consumers pay for in-store purchases (The Wall Street Journal, December 16, 2003). In 1999, the following usages were reported.
For the following ANOVA table are the results from treating 4 cultures with 6 observations for each culture. The enzymes are contained in test tubes with differing levels of enzymes applied.
Ccarry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
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