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In a random sample of five microwave ovens, the mean repair was $80.00 and the standard deviation was $11.50. Assume the variable is normally distributed and use a t-distribution to construct a 99% confidence interval for the population mean. What is the margin of error of the population mean?
In the Cash Now lottery game there are 10 finalists who submitted entry tickets on time. From these 10 tickets three grand prize winners will be drawn.
according to a december 2007 gallup poll 24 of american adults have visited a casino in the past 12 months. what is the
Calculate the standard deviation of the sample mean for samples of size 1, 4, 25, 100, 250, 500, 1000, and 5000. Graph your results with the sample size on the x axis and the standard deviation on the y axis.
airline overbooking is a common practice. due to uncertain plans many people cancel at the last minute or simply fail
suppose that in the baltimore metropolitan area 25 of the crimes occur during the day and 80 occur in the city. if
The standard deviation of test scores on a certain achievement test is 10.5. A random sample of 150 scores on this test had a mean of 72.8.
Age effects in medical care. The type of medical care a patient receives may vary with the age of the patient. A large study of women who had a breast lump investigated whether or not each woman received a mammogram and a biopsy when the lump was ..
Given that a Brand A battery just failed, what is the expected value of the time we wait until the next Brand B failure?"
on the average mr. z drinks and drives once in 4 years. he knows that every time when he drinks and drives he is caught
Research shows that the life time of Everlast automobile tires is normally distributed with a mean value of 70,000 miles and a standard deviation of 7,000 miles. What is the probability of having a tire that lasts more than 80,000 miles?
the quality control manager at a lightbulb factory needs to determine whether the mean life of a large shipment of
Six groups of randomly selected students matched for IQ and age were formed. Each student was taught a concept of time by using one of three methods: Lecture, demonstration
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