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In december 2001 the department of veterans affairs announced that it would begin paying benfits to soldiers suffering from lou gehrigs disease who had served in the gulf war. this decision was based on analysis in which the lou gehrigs disease incidence rate( the proportion devolping the disease) for 700,000 soilders sent to the gulf between august 1990 and july 1991 was compared to the incidence rate for the 1.8 million other soilders who were not in the gulf during this time period. based on this data, explain why it is not appropriate to perform a formal inference procedure ( such as the two sample z test ) and yet it is still reasonable to conclude that the incidence rate is higher for gulf war veterans than for those who did not serve in the gulf war.
Two semiconductor factories are being compared to see if there is a difference in the average defect rates of the chips they produce. In the first factory, 250 chips are sampled. In the second factory, 350 chips are sampled. The proportions of def..
Use a significance level of alpha = .05 to test the claim that p > .5. The sample is a simple random sample n = 50. Show how to calculate beta for the test and assume the true population proportion is .6.
An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by the local dealer. The customer relations department will survey a random sample of customers and compute a 99% confidence..
The standard deviation of the differences d for the paired sample data s d = ____________
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? Compute the value of the test statistic.
You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider? If convenient, use technology to construct the confidence int..
The Consumer Price Index (CPI) and the cost of a slice of pizza
Many vehicles used in space travel are constructed with redundant systems to protect the flight crew and their equipment. Find the probability that this shuttle component functions successfully if n = 2.
Jim Sellers is thinking about producing a new type of electric razor for men. If the market were favorable, he would get a return of $100,000, but if the market for this new type of razor were unfavorable
Run a simple regression of the dependent variable demand on the independent variable price and observe the coefficient on price.
The director of Heating and Oil at Superior Oil Company is concerned about the high cost of home heating oil being offered to their customers for the upcoming Fall season in Philadelphia, PA.
One person's file is chosen at random. Find out probability that selected person will fall into following categories. Book keeping.
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