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A manufacturer of microwave ovens is trying to determine the length of warranty period it should attach to its magnetron tube. You are told that the length of life of a magnetron tube is exponentially distributed with lambda=0.16. Suppose 100 samples of equal sizes are taken. What is the sampling distribution of the mean?
the author recorded actual temperatures along with temperatures that were predicted 5 days earlier. results are listed
Determine the expected shape of distribution of sample mean? Compute the likelihood of choosing a sample with mean of at least $112,000?
two hundred single sport athletes were cross-classified according to gender as
Scrap rates per thousand (parts whose defects cannot be reworked) are compared for 5 randomly selected days at three plants. Does the data prove a significant difference in mean scrap rates?
A research firm conducted a survey to determine the mean amount people spend at a popular coffee shop during a week. They found the amounts spent per week followed a normal distribution with a population standard deviation of $4.
Some students see a steady price, while others see regular sales that temporarily cut the price. Students are asked the price they would expect to pay. This is an example of?
In a surgey of 280 adults over 50.80%; said they were taking vitamin supplements. Find the margin of error for this survey if we want a 99% confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
A digital camcorder repair service has set a goal not to exceed an average of 5 working days from the time the unit is brought in to the time repairs are completed. A random sample of 12 repair records showed the following repair (in days)
To test the given claim using Single Proportion Z test.
A researcher had the idea that background music might enhance performance on a math test and that the effect of music might depend on whether an individual is a music lover or not.
According to studies, 1% of all patients who undergo laser surgery to correct their vision have serious post laser vision problems. In a sample of 95,000 patients, what is the approximate probability that fewer than 960 will experience serious..
kyle averages 5 finished accounts per day. his standard deviation is 1 account per day and we want to know how many accounts he has to finish in a day to be at his 79.95 percentile
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