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The service manager for a new appliances store reviewed sales records of the past 20 sales of new microwaves to determine the number of warranty repairs he will be called on to perform in the next 90 days. Corporate reports indicate that the probability any one of their new microwaves needs a warranty repair in the first 90 days is 0.05.
The manager assumes that calls for warranty repair are independent of one another and is interested in predicting the number of warranty repairs he will be called on to perform in the next 90 days for this batch of 20 new microwaves sold.
What is the probability that only one of the 20 new microwaves sold will require a warranty repair in the first 90 days?
at a certain university the average attendance at basketball games has been 3200 spectators per game. the attendance
(i) what is the probability that the longest time interval between calls is less than 15 minutes? (ii) What is the probability that the shortest time interval between calls is greater than 5 minutes?
What is the probability that a randomly selected child in 2004 lived in poverty? Is whether a child lives in poverty or not independent of whether (s)he lives in a single-parent or married-couple home?
What is the standard deviation of the sampling distribution?
Find a 99% confidence interval for the mean pH in rainfall and interpret the interval and what assumption must be made for the confidence interval to be valid?
Dr. Dave is interested in determining if a new drug called Curezall will be more effective in the treatment of depression than SSRI's
For each of these behaviors, test whether there is a gender difference in the proportions, using the a = 0.05 significance level
Obtain a 95% confidence interVal for the difference in mean height.
Assume the underlying population is normal and that σ = 3.4. Is there any evidence to suggest that the download speed for the United States is greater than the world population mean? Use a = 0.01.
A banks loan officer rates applicants for credit. The ratings are causally distributed with a mean of 200 also a standard deflation of 50.
Consider all random samples of 6 4 test score s. What is the standard deviation of the sample means ? (Round your answer to three decimal places)
In a random sample of 200 automobile insurance claims obtained from all state insurance Company, mean=$615 and s= $135. Calculate the following intervals:
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