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Question: Records on a fleet of trucks reveal that the average life of a set of spark plugs is normally distributed with a population mean of 22,100 miles. A manufacturer of spark plugs claims that its plugs have an average life in excess of 22,100 miles. The fleet owner purchased 18 sets and found that the sample average life was 23,400 miles, the sample standard deviation was 1,500 miles and the calculated value of t = 3.677. Based on these findings, is there enough evidence to accept the manufacturer's claim at the 0.05 level. (Explain your answer)
Explain how significance is determined in simple terms as well and define a statistical interaction and how it affects your results. Give an example. List the variables that are interacting and why.
A young man has 4 girlfriends A, B, C, D One night he wrote a love letter to each of the girls, and addressed 4 envelopes. But before he puts the letters in the correct envelopes, there is a power outage and he just puts the letters in the envelopes ..
Find the 95% confidence interval of the mean score for all golfers if this is a sample of 110 golfers instead of a sample of 93.
A sample of 49 provides a sample mean of 38 and a sample standard deviation of 7. Determine the standard error of the mean.
q1. explain the difference between multiple independent variables and multiple levels of independent variables. which
Assume the least squares equation is Y' = 10 + 20X. What does the value of 20 indicate?
Test whether the relationship between the plan at retirement and residential area using Chi square test.
a local drugstore owner knows that on average 100 people per hour stop by his store. find the probability that in a
Rosenberg Land Development
A study 200 nurses found that of 125 females nurses, 56 had bachelor's degree; and of 75 male nurses; 34 had bachelor degrees. if a nurse is selected at random, find the probability that the nurse is a female nurse with a bachelor degree.
according to a survey of the top employers in a major city in the midwest a worker spends a average 413 minutes a day
The airplane will make a successful flight if at least 50 percent of its engines remain operative. For what values of p is a 4-engine plane preferable to a 2-engine plane?
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