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A radio station sells advertising spots on the basis that the mean age of its listeners is 25 years. Assume that a random sample of 64 listeners shows a mean age of 26 yrs and a standard deviation of 5 yrs.
At the 5% significance level, can the station conclude that the mean age of its listeners is not 25 yrs. Formulate and test the appropriate hypotheses. Use the critical value approach.
Is there evidence of difference in median performance between two methods? (Use α = 0.05.)
The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution
Develop a 99% confidence interval for the population proportion.
What is the probability of making a Type II error if the population mean is 24,000 miles?
Find the probability of accepting a lot as a function of the actual fraction of defective chips. In particular, let the actual fraction of defective chips in a given lot equal any of 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14, 0.16, 0.18. Then compu..
Determine the special property of standard normal distribution, compared to other normal distributions?
Based on a study of heights of men and women who do gymnastics, a researcher concludes that the exercise from playing gymnastics causes people to become shorter. Do you agree with this conclusion?
Creek Ratz is a very popular restaurant located along the coast of northern Florida. They serve a variety of steak and seafood dinners. During the summer beach season, they do not take reservations or accept a call seating.
Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.
Finding the Equation of the Regression Line and Making Predictions. Find the regression equation,
You're in charge of an experiment to evaluate a treatment which is advertised as being 90% effective at killing a particular insect. You plan an experiment in which the treatment is tested on 200 insects.
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
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