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A company is filling bags of rock salt to a level of 50 pounds. It believes that all bags are filled correctly, but would like to use a hypothesis test with an alpha of 0.05 to check this belief. The company will be using samples of 100 bags from each run to do the test. State the null and alternative hypotheses:
The first and third quartiles were 17.95 and 35.45 miles per gallon, respectively, Develop a box plot and comment on the distribution. Is it a Symmetric distribution?
What value is business research and hypothesis testing to a company? How long should it take a company to complete a scientific research study?
Western residents reported that they were completely satisfied with their local telephone service. Find the 95% confidence interval for the difference in two proportions.
Suppose that a certain college class contains 45 students. Of these, 26 are sophomores, 25 are chemistry majors, and 7 are neither. A student is selected at random from the class.
A mean of 22 miles-per-gallon and a standard deviation of 5 miles-per-gallon. What is the probability that a car will get less than 21 miles-per-gallon.
Assume you are the manager of a paint manufacturing factory. Your company has received complaints from customers that the containers hold less than the amount printed on them.
Use the Kolmogorov-Smirnov test with significance level 0.05 to decide whether the following lifetimes (in days) of a sample of cancer bearing mice.
Find the mean, median, and mode for the following sample of scores: 2,3,3,1,2,5,2,3,4,2
Find the 90% confidence interval for the standard deviaiton of the ages of seniors at Oak Park College if a sample of 24 students has a standard deviation of 2.3 years. Assume the variable is normally distributed.
Sixty percent of the families in a certain community own their own car, thirty percent own their own homes, and twenty percent own both their own home and own car. If a family in the community is randomly chosen, what is the probability that they ..
Twenty-eight items are randomly selected from a population of 260 items. The sample mean is 38 and the sample standard deviation 5. Develop a 90 percent confidence interval for the population mean.
What score was earned by more students than any other score? Why? What was the highest score earned on the exam?
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