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Assume that we would like to evaluate within $10 mean salary of all graduates who were business majors in college. How many business majors would be required to evaluate mean salary to within 10 with 95% confidence if population standard deviation is %200.
A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph.
The ages of circulating pennies are right skewed. Most circulating pennies were minted relatively recently, and extremely old pennies are rare. Assume the ages of circulating pennies have a mean of 12.2 years and a standard deviation of 9.9 years.
A pharmaceutical company has developed a screening test for a rare disease that afflicted 2% of the population. Unfortunately, the reliability of this test is only 80%, which means that 20% of the tested will get a false positive.
IS there any evidence that a freshman's chances to graduate may depend upon what kind of high school the student attended? Describe.
A random variable has the density curve as in the graph below. Find The height of the density curve?
Graphical method to solveout the linear programming problem. Describe where the following TEO constraints intersect.
Find out the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? What percent of the garages take between 29 hours and 34 hours to erect?
Is there evidence that the population mean is above $300, if X (bar) = $305.11 and s = $43.20?
Some television stations attempt to gauge public opinions by posing a question on the air and asking viewers to call to give their opinions.
It is estimated that 2% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 95% accurate. What is the probability that an athlete who tests positive is actually a user?
Chi-square test for goodness of fit - difference in the use of the four entrances?
Choose a business problem that is based upon an experience from your place of work or home environment. Briefly describe the business problem and the research methodology that you would employ to gather data and test your hypothesis
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