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Sixty percent of the employees in a certain department are female. One third of the females drive foreign cars. The rest drive domestic cars. Twenty-five percent of the males in the department drive foreign cars. One person is randomly selected from the departmental files. Use this information to construct a probability table, and then calculate each of the following probabilities:
Are the events female and foreign car owners independent? Why or why not?
What is the mean and standard deviation of the sampling distribution when we take all samples of size25?
Carry out the suitable calculations to test for effect modification. Interpret your results.
By using the normal probability distribution, what is the probability the car will be repaired in 35 minutes or less?
In a binomial distribution n = 8 and π = 0.2. Determine the probabilities of the following events.
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below.
What is the probability that a roulette ball will come to rest on an even number other than 0 and 00?
If there are 5 choices for a question and there is a 50% chance that the student knows the answer, what is the probability that the student knew the answer to a question he correctly answered?
Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
What is the arithmetic mean selling price?
Does this result support original claim, or is population percentage considerably less than 45%. Use alpha=.05 for level of significance.
Standard deviations for first- and second-time and confidence interval
It has been claimed that women live longer than men; however, men tend to be older than their wives. Ages of sixteen husbands and wives from England were obtained. These data should be analyzed with a
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