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Suppose that the height of 100 male students at xyz represent a random sample of height of all 1546 student in a college, find 99% confidence interval for estimating their mean height and find 95% confidence interval for estimating the mean height.
The length of time to do a complete full service oil change at Speedy-Lube is normally distributed with a mean of 15.8 minutes and a standard deviation of 2.2 minutes
Solve using the quadratic formula: Radicands must be enclosed within
It is often stated in three-shift manufacturing organizations that the quality of work on the second shift is worse than on the first, and that the quality of work on the third shift is worst of all. How would you go about testing that premise?
A random sample of n = 4 scores is chosen from the population with µ = 80 and σ = 20. On average, how much difference would you expect between sample mean and population mean?
Has there been a significant shift upward in the percentage of persons who want to go to Europe? Using the .05 significance level for this study.
Compute the test statistic. Use the t distribution table to compute a range for the p value. What is the rejection rule using the critical value? What is the conclusion?
A company's employees are working to create a new energy bar. They would like the two key ingredients to be peanut butter and oats, and they want to make sure they have enough carbohydrates and protein in the bar to supply the athlete.
Tests it and then puts it to one side. this is repeated 5 times. What is the probabilty that none of the five tested were faulty?
Is it reasonable to conclude the mean income of those selecting Plan B is larger? What is the p-value? Do the coefficients of skewness affect the results of the hypothesis test? Why?
Let X be the number of calls you need to make until you find your friend. Give the probability mass function for X. How many calls do you expect to make until you find your friend?
Use exponential smoothing to develop simple, trend (Holt's), and seasonal models (both simple and trend) for forecasting the quarterly revenue from 1-year batteries.
What is the probability that the average of the scores of the two students from university A will be greater than average of the scores of the three students from University B?
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