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A manufacturer of car batteries claims that his batteries will last, on average, 3 years with a variance of 1 year. If 5 of these batteries have lifetimes of 1.9, 2.4, 3.0, 3.5, and 4.2 years, construct a 95% confidence interval for a2 and decide if the manufacturer's claim that a" = 1 is valid. Assume the population of battery lives to be approximately normally distributed.
For testing the null hypothesis at the 4% level of significance that mu GE 100 vs the alternative that mu
The response time for Denver police to respond to emergency calls is 8.4 minutes with a standard deviation 1.7 find the probability that the response time for a call between 5 and 10 minutes.
The production manager at Bellevue Steel, a manufacturer of wheelchairs, wants to perform a second analysis of the number of defective wheelchairs produced on the day shift and afternoon shift.
With a mean of 805 pairs of jeans and a standard deviation of 207 pairs. What is the probability that the company will make a profit each month?
A production process manufactures items with weights that are normally distributed with mean 16 pounds and standard deviation 0.15 pound. An item is considered to be defective if its weight is less than 15.8 pounds or greater than 16.2 pounds.
Three members of a club will be selected to serve as officers. The first person selected will be president, the second person will be vice-president and the third will be secretary/treasurer.
What conclusions can you draw about the nature of the relationship between anxiety and exam performance?
After surveying 90 couples, they determined the mean of their sample to be $150 and the standard deviation was $5. What is the 95% confidence interval for the population mean?
According to the National Institute for Occupational Safety and Health, job stress poses a major threat to the health of workers. A national survey of restaurant employees found that 75% said that job stress had a negative impact on their personal..
The lower limit for a 95% confidence interval for the population proportion if a sample of size 200 had a 40 success is.
Eagle airlines' planes hold only 15 people. Past records indicate that 20% of the people making a reservation do not show up. We will assume that all reservations are independent; that is each reservation is for one person and these reservations a..
This is my own made up problem. I just want to learn which test would I use t,z, or Chi and HOW do I go about doing it.
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