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A simple random sample of 25 movies is taken from a movie website and the average lengths of them are found to be 150 min. The population standard deviation is known to be 10 min.
a. Test the hypothesis that the population mean length is greater than 145 min using the 0.05 level of significance.
b. Test the hypothesis that the population mean of movies length is different from 155 min using the critical value approach and a 0.05 level of significance.
A sample of 400 bags of dog food which are advertised to contain twenty-five pounds had a mean content weight of 24.5 pounds with a standard deviation of 3 pounds.
Construct a 94% confidence interval for the true mean fill volume for all jugs of softener.
What are the following probabilities? (Round your answers to three decimal places.) (a) all the students are able to pass the polygraph examination
In a random sample of visitors to a famous tourist attraction, 84 of 250 men and 156 of 250 women bought souvenirs. Construct a 95% confidence interval for the difference between the true proportions of men and women who buy souvenirs at this tour..
Imagine you are a manager at a major bottling company. Customers have begun to complain that the bottles of the brand of soda produced in your company contain less than the advertised sixteen (16) ounces of product.
What is a sales territory? Why do firms establish sales territories? Why might sales territories not be developed?
errors in a billing process often lead to customer dissatisfaction and ultimately hurt bottom-line profits. an article
mcdonalds waiting times. you want to estimate sd for the population of waiting times at mcdonalds drive up windows. you
a survey of a simple random sample of university alumni finds that six months after graduation 75 of the 100 liberal
Using the empirical rule (as presented in the book), what is the approximate percentage of cars that remain in service between 43 and 54 months?
For the following questions, assume a normally distributed population.
What is the probability for the given frequency distribution?
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