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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?
Assume that demand for the upcoming weekend is normally distributed with a standard deviation of 30.
The results for college x was a mean of 5 hours and an estimated population variance of 2 hours: for college y, m= 4, s 2 =1.5; and for college Z, M= 6, s 2 =2.5 what should you conclude? Use the .5 level.
Use the model to predict the selling price of a house that is 1,860 square feet.
What are the expected value and standard deviation of the number of small aircraft that arrive during a 90-min period?
An experiment is set to test the hypothesis that a given coin is unbiased. The decision rule is the following: Accept the hypothesis if the number of heads in a sample of 200 tosses is between 90 and 110 inclusive, otherwise reject the hypothesis.
There is a horse race with 12 horses competing. A gambler must rank the 12 horses for first, second, third and fourth place finishing.
The election is one week away. You think you have the election sewn up, but the seem appears to be unraveling. You run a poll, draw a random sample of 500 adults.
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
The number of passengers arriving at an airport terminal average 1200 each hour. To process passengers (check in, take luggage, etc) take an average of 6 minutes each. There are 6 airport staffers processing passengers. How long is the average wai..
During a meeting, one hospital administrator indicated that 70% of the geriatric patients are males. What is the sample proportion of male patients?
During the past year, the mean sales of Wshington Reds in cases was 45,000 cases, and the standard deviaiton was 4,450. How many cases of Washington Reds should be brought to market? Assume the sales follow a normal distribution.
Sample mean = $40,000, sample standard deviation =$1500 and n= 25. Assume that the population from which the sample is drawn is normally distributed.
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