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Routine physical examinations are conducted annually as part of a health service program for the employees. It was discovered that 8% of the employees needed corrective shoes, 15% needed major dental work and 3% needed both corrective shoes and major dental work. What is the probability that an employee selected at random will need either corrective shoes or major dental work?
A) 0.20
B) 0.25
C) 0.50
D) 1.00
E) None of the above
what is an independent sample? what is a related sample? when must researchers use different hypothesis tests for
Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
Conduct a hypothesis test to determine whether the whisper number justifies a conclusion of a statistically significant increase in the consensus estimate of economists. Use a = .01 as the level of significance.
Give a 95% confidence interval for the mean of the population from which the sample is drawn.
Suppose that the average annual salary for a worker in the United States is $30,000 and that annual salaries for Americans are normally distributed with a standard deviation equal to $7,000. Determine the following:
What information does each measure of central tendency provide? Why are measures of variability essential statistical tools for describing behavior?
Jamie expects that a bulb will last for 400 to 500 days, what is the probability of an Acme bulb satisfying that?
According to a recent survey, Americans get a mean of 7 hours of sleep per night. A random sample of 50 students at West Virginia University revealed the mean number of hours slept last night was 6 hours and 48 minutes
Suppose the time necessary to process an application for a license plate for a newly purchased vehicle is normally distributed with mean of 6 minutes and standard deviation of 1.5 minutes.
in a recent survey concerning company sales and net earnings 15 companies responded. data analysis was computed letting
An error of .01 in the computation of the short interest rate, approximately what error do you expect to make in the computation of the value of the portfolio?
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