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Construct a 95% confidence interval for the population mean, u. Assume the population has a normal distribution. A sample of 17 college students had a mean annual earnings of $3120 with a standard deviation of $677.
Lower limit________
Upper limit________
1. the response to a question has three alternatives a b and c. a sample of 120 responses provides 60 a 24 b and 36 c.
Find the probability that a randomly selected teacher earns and what sample size is necessary to double the standard error of the mean and what sample size is needed to cut the standard error of the mean in half?
q1. the width of a confidence interval will bea. narrower for 95 confidence than 99 confidenceb. wider for a sample
According to an IRS study, it takes a mean of 330 minutes for taxpayers to prepare, copy and electronically file a 1040 tax form. The distribution of times follows the normal distribution and the standard deviation is 80 minutes. A consumer watchd..
At the .025 significance level, can we conclude that less than 88 percent of the orders are delivered in less than 10 minutes?
Show that theta~ = u(X) is an unbiased estimator of theta, where u(0) = 1 and u(x) = 0 if x =1,2, ... Compare the MSEs of theta(hat) and theta~ for estimating theta = e^(-m) when m=1 and m=2
The manager of the greeting card section of Mazey's department store is considering her order for a particular line of Christmas Cards. Develop the payoff table for this decision situations.
A real estate agent in the coastal area of Georgia wants to compare the variation in the selling price of homes on the oceanfront with those one to three blocks from the ocean.
a survey of 35 randomly selected iphone owners showed that the purchase price has a mean of 432 with a sample standard
A sample of 84 golfers showed that their average score on a particular golf course was 89.05 with a standard deviation of 3.47.
A location along a 500 foot assembly line from which to observe the work habits of the workers on the line. What is the probability that the point she selects: is within 25 feet of the end of the line.
Suppose the following table shows the number of colds 7 different people got during the typical cold season based on the number of times they washed they washed their hands per day during the cold season.
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