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A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours. If 36 mechanics are randomly selected, find the probability that their mean rebuild time is less than 8.9 hours. What is the standard deviation of the sample mean?
Explain how much money do these people make each year. Suppose you read in your local newspaper that 45 officials in student services whioch is earned as an average.
Test the hypothesis that the dogs did significantly better than what would be expected with random guessing.
She wants to be 90% confident and be accurate within 5% of the true proportion. Find out the minimum sample size necessary.
The random variable X has which of the following probability distributions and What is the probability that no student wins
We are interested in testing to see if the variance of a population is less than 7. The correct null hypothesis is:
Show the decision rule graphically. Use the .05 significance level.
At the .05 significance level, is there a difference in the mean number of calls per day between the two employees?
The Appliance Center has six sales representatives at their North Jacksonville outlet. Listed below is the number of refrigerators sold by each last month.
Events A and B are mutually exclusive events defined on common sample space. If P (A) 0.5 and P (A or B) = 0.70, determine P (B).
Nancy believes that the average running time of movies is equal to 140 minutes. A sample of 4 movies was taken and the following running times were obtained. Assume the population of the running times is normally distributed.
From her district, consisting of several hundred stores, she selects a random sample of 30 stores. For each store she gathered the following information.
Explain the meaning of the conditional mean of the dependent variable in the population regression function. Illustrate using an example.
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