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If 100 tires are randomly selected for shipment to an outlet, what is the probability that they are all good? should this outlet plan to deal with defective tires returned by consumers?
suppose the two events A and B are mutually exclusive. what is the probability of their joint occurrence ?
A car rental company has determined that the probability a car will need service work in any given month is 0.2 and The company has 900 cars.
He has $7.5 million TV studio at his fingertips. Before accepting Mr. Portway's reason, what question should you ask him? State the question, and explain why it is relevant.
A survey of 1600 Democrats and 900 Republicans (all randomly selected) showed at 90% confidence a margin of error of +- 2 for Democrats and +- 3 for Republicans. Why is there a difference?
A scientist wants a confidence interval of 90% and a margin of error of +-2 for a mean of a Normal population with σ =10. What size samples should she take?
The margin of error for a sample size 25 is +-3. Will the margin of error be greater or less if the sample size is 400? What is the new margin of error?
A population is Normally distributed and has a σ = 24. Samples of size 25 have a sample mean of 100. Find the 90% confidence interval for the population mean.
The standard deviation of the population is 4. a. Find the 95% confidence interval of the mean number of ER patients treated each day at the hospital.
The variance for the second sample is s2 = 50. If the null hypothesis is true, then how much difference should be expected, on average, between the two sample means?
Deductible per loss and limited to a maximum payment of 2000 per loss? Please answer for the ?per loss ?variable, not the per payment? variable.
Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,350 per hour and a standard deviation of $255. What is the operating cost for the
Microfracture knee surgery has a 75% chance of success on patients with degenerative knees. The surgery is performed on 5 patients. Find the probability of the surgery being successful on less than
An assembly line randomly selects parts for inspection, and 8% of the inspected parts are found to be defective. If the parts are inspected in groups of 20, find the mean number of defective parts p
State the null and alternative hypothesis if the average electric bill for residents of White Pine Estates exceeds $52.98 per month.
A sprinkeler system inside an office building has two typwsof activation devices, D1 and D2, which operate independently. When there is a fire, if either device operates correctly, the sprinkler sys
Furthermore, a histogram shows that the expenses are approximately normally distributed. Find an interval that estimates 99.73 percent of all one-day travel expense to Moscow.
How large a sample size will need to be selected if we wish to have a 99% confidence interval for the average diameter of this type of O-Ring with a margin for error of .02 centimeters?
The Federal Government is stepping up efforts to reduce average response times of fire departments to fire calls. Find the probability that a randomly selected response time is less than 15 minutes.
The monthly utility bills are normally distributed with a mean value of $130 and a standard deviation of $15.
The ages of U.S. aircraft have a mean of 13.0 years and a standard deviation of 7.9 years. If the Federal Aviation Administration randomly selects 35 commercial aircraft for special stress tests, fi
In a recent survey, 80% of the citizenry in a community favored the building of a municipal golf course. If you ask 15 citizens about this project, find the probability that at least 9 favor the gol
A state executive claims that the average number of acres in western Pennsylvania State Park is less than 2000 acres. A random sample of five parks is selected, and the number of acres is shown. At
The average hourly wage last year for members of the hospital clerical staff in a large city was $6.32. The standard deviation of the population was $.54. This year a sample of 50 workers had an ave
A population has a mean = 80, with standard deviation = 8. The distribution of sample means for samples of size n = 4 selected from this population would have an expected value of?