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1. A pharmaceutical company has specified that the variation in the quantity of active ingredient in its leading prescription medication must be such that the population standard deviation must be no more than 1.20 micrograms. The ingredient content of the pills is normally distributed. In a random sample of 20 pills, the standard deviation is found to be s 5 1.32 micrograms. Based on the sample data, use the a 5 0.05 level in testing H0: u # 1.20 micrograms versus H1: u . 1.20 micrograms.
2. During the early stages of production for a single-cylinder engine designed for use in portable gen- erators, the manufacturer randomly selects 12 engines from the end of the assembly line and subjects them to a battery of tests. In the horsepower tests, the engines are found to have an output standard deviation of s 5 0.18 horsepower. Assuming a normal distribution of horsepower outputs, determine the 90% confidence interval for u.
a multiple choice test consists of 60 questions. each question has 4 possible answers of which one is correct. if all
the following data represents the travel time in minutes to school for nine students enrolled in sullivans college
A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample standard deviation of 12.
Dr. H wants to conduct a statistical test that will show her new medication to be effective in decreasing violence in criminals. What is the null hypothesis? What is the alternate hypothesis?
Suppose you are testing the differences in attitudes toward health care reform using Democrats, Republications, and Independents. What statistical test would you use?
suppose a study of 196 randomly sampled privately insured adults with incomes over 200 of the current poverty level is
Calculate a 95 percent confidence interval for the mean percentage share of billing volume from network television for the population of all US advertising agencies.
estimating the confidence interval for population mean.the superintendent wants to determine the average amount of
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a random sample of 20 purchases showed the amounts in the table in . the mean is 49.33 and the standard deviation is
these cars would fall into the 22 to 27 mpg range? Compute the proportion of cars that get more than 28 mpg. What proportion of cars would get less than 23 mpg?
industry standards suggest that 32 of new vehicles require warranty service within the first year. jones nissan in
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