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The mean annual salary for chauffeurs is $21,000. A random sample of size 45 is drawn from this population. Assume that the population standard deviation is $1,500. What is the probability that the mean annual salary is less than $20,000 More than $22,500.
Compute the mean and variance of the discrete probability distribution and determine the probabilities of the following events using the binomial formula.
14 machines are planned to be used for a 60-day production run for a customer. The operating time is 1660 hours. Upon failure, a machine must be returned to the manufacturer for repair.
A random sample of 20 single men were asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that at least 18 of the men will say yes.
The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
Using one proportion z test to find whether or not to support the claim - There is little evidence to reject H 0 , therefore they conclude the tvs are 20 pounds on average.
Use Excel and determine the number of each type of person that will be needed to complete the job within the allotted time and at minimum cost.
First- and second-place trophies are awarded to the two persons receiving the highest and second-highest number of votes. In how many different ways can the trophies be awarded?
Investigate the comparative pros and cons of the mean and the median. Find examples where the mean is more appropriate than the median and vice-versa. Discuss the locations of the mean, median and mode for a normal, left-skewed and right-skewed di..
Management plans to sample 150 packages per week. What is the appropriate control chart?
Based on these results, a confidence interval for the population mean is found to be u = 5.7 PLUS OR MINUS 4.4. Find the degree of confidence.
As it is a 2 _ 2 table, try also two-tailed two-sample z test for ð1 = ð2 and verify that z2 is same as your chi-square statistic. Which test do you favour? Describe why?
question suppose an influenza epidemic strikes a city. in 10 of families the mother has influenza in 10 of families
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