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Let X be a discrete random variable that is uniform over the set of integers in the range [a,b], where a and b are given integers such that a < 0 < b. Find the PMF of the random variables max{0,X} and min{0,X}.
Evidence of statistical interaction or effect modification. What is the odds ratio for diabetes in a man aged 65 compared with a woman aged 60 (both have the same waist circumference)?
I am not understanding how to do this question as I am still trying to grasp an understanding of the material. I came across this question at the end of the chapter:
If you had only one minute to estimate the standard deviation of a frequency distribution using only the information that can be obtained from a stem and leaf display, how would you do it and why?
Researchers wanted to determine if there is a difference in the mean credit card debt owed by males versus females. Using α = 0.10, is there a difference. (Show all six steps of hypothesis testing.)
Do hotel managers on the average differ significantly in femininity score from men in general? Assume that the standard deviation of scores in the population of all male hotel managers is the same.
Suppose we wish to estimate the population mean using a confidence interval. When is it appropriate to use a z-score? When is it appropriate to use a t-score?
What is the probability that the total number of customers who enter the supermarket in one day is greater than 11700?
Suppose we have a ""black box" which on command can generate the value of a gamma random variable with parameters 1.5 and 1. Explain how we can use this black box to approximate
The profit from selling food at an outdoor cafe depends on the number of hours of sunshine through the formula, Profit = 1000(1-(e -x /10)). Find the expected level of profit.
Compare your best difference to the result from an ordinary two-sample t-test between these groups. Comment the difference.
Assuming that = 119.5 ng.ml, test the claim that the mean cotinine level of all smokers is equal to 200.0 ng/ml. Use a 0.05 significance level.
Twenty-five percent of the employees of a large company are minorities. A random sample of 7 employees is selected. What is the probability that the sample contains exactly 4 minorities?
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