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Assuming that the heights of college women are normally distributed with men 65 inches and standard deviation 2.5 inches (based on information from the Statistical Abstract of the United States, 112th edition), answer the following questions:
Sample mean is 12.2 days and sample standard deviation is 10 days. How many personnel files would director have to choose to evaluate to within 2 days with 99% confidence interval?
according to the internal revenue service the mean tax refund for the year 2007 was 2708. assume the standard deviation
Develop upper and lower control limits (99.7%) for the proportion of students with complaints.
Ten asthmatics were asked to compare the effect of salbutamol and fenoterol sprays in relieving their asthma attacks. Assume that salbutamol and fenoterol are equal in terms of effectiveness and side effects in all people
The following table describes the asset allocation of your portfolio with the corresponding return in percentage, X, and the proportion of that specific asset in the portfolio, P(X).
a shell oil company executive says that a majority of workers more than 50 prefer a 10 hour four day work week over an
For a Shewhart control chart using 3-sigma limits,
it is the responsibility of the federal government to judge the safety and effectiveness of new drugs. there are two
What is the difference between a normal distribution and a standard normal distribution? What is the purpose of using a standard normal distribution instead of the normal distribution?
You decide to predict gasoline prices in different cities and towns in the U.S. for your term project. Your dependent variable is price of gasoline per gallon and your explanatory variables are per capita income
The computer breaks down x times during t hours, it costs 50x2 dollars to fix it. How should the company select t in order to maximize the expected profit?
one hundred people participate in a lottery. one will win the grand prize of 1000 and five more will win consolation
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