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A 15-minute Oil and Lube service claims that their average service time is no more than 15 minutes. A random sample of 37 service times was collected, and the sample mean was found to be 16.5 minutes, with a sample standard deviation of 5.1 minutes. Is there evidence to reject the claim at the alpha = 0.02 level? Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results any group over 30 needs z test.
If not what would be a better testing strategy? Could you form a Null Hypothesis or an Alternative Hypothesis? If yes, what would they be.
The standard deviation of the sample is $3,000. Interpret your findings.
if 50,000 parts are produced, how many would you expect to fail to meet a minimum specification limit of 35lb tensile strength? How many would have a tensile strength in excess of 48lb?
Assume that the annual rate of return for a common biotechnology stock is normally distributed with a mean of 5.5% and a standard deviation of 6%.
In this the anniversary of the sinking of the Titanic, it is interesting to look at the distribution of those who survived, and those who died. The table below describes the number of men, women and children who were passengers on the Titanic.
Explain why one would expect to find a positive correlation between the number of fire engines that respond to a fire and the amount of damage done in the fire. Does this mean that the damage would be less extensive if fewer fire engines were disp..
Choose the correct answer using sum of squared error (SSE).
What is the estimated increase in the interval of time until the next wruption that corresponds to an increase of 60 seconds in the duration?
The average daily jail population in the United States is 706,242. If the distribution is normal and the standard deviation is 52,145, find the probability that on a randomly selected day the jail population is:
A manufacturer of flashlight batteries took a sample of 13 batteries from a day's production and used them continuously until they failed to work.
The profit from selling food at an outdoor cafe depends on the number of hours of sunshine through the formula, Profit = 1000(1-(e -x /10)). Find the expected level of profit.
USA Today reported on preferred types of office communication by different age groups. Suppose the results were based on a survey of 500 respondents in each age group.
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