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In order to test the effectiveness of a drug called XZR designed to reduce cholesterol levels, 9 heart patients' cholesterol levels are measured before they are given the drug. The same 9 patients use XZR for two continuous months. After two months of continuous use the 9 patients' cholesterol levels are measured again. The comparison of cholesterol levels before vs after administering the drug is an example of testing the difference between: a)matched pairs from two dependent populations b) two population variances from independant populations c)two means from independent populations d)two population proportions.
Determine the mean and the standard deviation of the sample.
ABC Convenient stores uses fixed-time period model to determine order quantity for their popular chewing gum (Supergum). Daily demand for Supergum is 100 units with a standard deviation of 25 units.
To find out whether the course is effective in increasing sales, the appropriate set of hypothesis for testing is:
In a sample of 49 adolescents who served as the subjects in an immunologic study, one variable of interest was the diameter of skin test reaction to an antigen.
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
A researcher wishes to construct a 95% confidence interval for a population mean. She selects a simple random sample of size n=20 from the population.
If 36 sand dollars are selected at random for collection, determine the probability that average diameter of those sand dollars is more than 3.80 centimeters. Suppose that variable is normally distributed.
What are the best-case and worst-case outcomes the owner may face on this product if she implements your suggestion?
A rental agent claims that the mean monthly rent, mu, for apartments on the east side of town is less than $725. A random sample of 13 monthly rents for apartments on the east side has a mean of $724, with a standard deviation of $15.
Determine the probability that no more than 10 firms are perfectly competitive?
A study of the scores on an in-plant course in management principles and the years of service of the employees enrolled in the course yielded the following statistics.
Formulating null and alternative hypothesis to test the claim averaging about $5000.
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