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Suppose that the average number of years to graduate at a university is 4 years, with a standard deviation of 0.5 years. Assume a bell-shaped distribution for years to graduate.
1.From the Empirical Rule, what is a range of values that 95% of the students should graduate between?2.From the Empirical Rule, what is a range of values that 68% of the students should graduate between?3.From the Empirical Rule, what is a range of values that 99.7% of the students should graduate between?4.Suppose that the average height for college men is 66 inches. If the height distribution is bell-shaped, and 95% of the men have heights between 60 inches and 72 inches, what is the standard deviation of heights for this population?
How many students should be surveyed if a 90% confidence interval is desired and the margin of error is to be only 3%?
The dying rate in an industrial process is department of many factors and varies according to the following distribution.
A psychiatrist hires you to study whether her clients self-disclosed more while sitting in an easy chair or lying down on a couch. All clients had previously agreed to allow the sessions to be videotaped for research purposes.
What information is obtained from measurements on an interval scale compared to measurements on an ordinal scale. What information is obtained from measurements on a ratio scale compared to measurements on an interval scale?
Let x1, ..., xn be a random sample from an exponential distribution, X ~ EXP(theta) a) If x(bar) = 17.9 with n = 50, then find a one-sided lower 95% confidence limit for theta.
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial.
Can you determine the number of levels used for each factor? Explain. Describe a treatment for this experiment and determine the number of treatments used.
Use a two proportion z-test to perform the required hypothesis test. State the conclusion.
As part of a long-term study of individuals 65 years of age or older, sociologists and physicians at the Wentworth Medical Center in upstate New York conducted a study to investigate the relationship between geographic location and depression.
What do you find out when you perform the nonparametric statistics?
Find the probability that when 12 adults are randomly selected, at most 1 is in excellent health. Round your final answer to 3 decimal places.
Enter the data and use the appropriate commands to find the mean, median, mode, sample standard deviation, population standard deviation, 10% trimmed mean, and data count.
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