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A manufacturing process has a 90% yield, meaning that 90% of the products are acceptable and the remainder are defective. If 4 of the products are randomly selected, find the probability that all of them are acceptable.
What is the probability that the mean breaking strength of the 3 untreated specimens is at least 25 pounds greater than the mean strength of the 3 treated specimens?
What if the number of debilitating network viruses detected in a day at the firewalls of an Internet service provider within a certain geographic region is fueling a possible management decision to upgrade the detection system.
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 standard deviation of the ages of a sample of 21 executives from the northern states was 8.4 years; while the standard deviation of the ages of a sample of 30 executives from southern states was 12.8 years.
Why might normality be an issue here? (c) What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence? (d) If this is not a reasonable requirement, suggest one that is.
Suppose you have the experiment of flipping a coin three times.
An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a standard deviation of $78.11.
The hypothesis is that the average number of customers served per hour is 24 or less against the alternative hypothesis that the mean number of customers waiting is greater than 24.
A supervisor has noticed that sales for all departments world wide has been averaging $12,000 a month for a number of years. For the last 18 review periods the average sales figure has dropped to $11,500 with a standard deviation of $4,000. Manage..
A professor wants to conduct a study to know whether the grades she gives to her students affect their evaluations of her. She teaches four classes of ten students each.
Assume a random sample of 50 architects and engineers is selected. How likely is it that the random sample contain five or fewer women in these positions.
Find a point estimate of the population mean. Find the 95% confidence interval of the population mean. Assume the variable is normally distributed.
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