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1. Testing the effect of a diet and exercise regimen on subjects' cholesterol levels, a sports medicine clinic enlists 40 volunteers whose cholesterol levels are mea- sured before and after the 1-month program. The before and after data are listed in data file XR14058. Using the sign test and the 0.025 level of significance, examine the effectiveness of the diet and exercise program. Identify and interpret the p-value for the test.
2. According to R.L. Polk & Company, the median age of automobiles and trucks on the road in the United States is about 9 years. The ages for a random sample of vehicles in the executive parking lot of a metal fabrication company are listed in file XR14059. Using the sign test and the 0.05 level of significance, examine whether the median age for cars driven to work by the com- pany's executives might be less than the median reported by R.L. Polk. Identify and interpret the p-value for the test.
Source: theautochannel.com, July 31, 2009.
The company believes that it averages about the same weight per bag in each of two production lines. To test this idea, they will perform a hypothesis test to compare the two lines at the alpha level of 0.05. State the null and alternative hypothe..
If you draw one ball from the urn what is the probability that it is blue or white?
A large discount chain compares the performance of its credit managers in Ohio and Illinois by comparing the mean dollar amounts owed by customers with delinquent charge accounts in these two states.
a facilities manager at a university reads in a research report that the mean amount of time spent in the shower by an
Determine the frequency of wrong numbers given to callers. Each sample consisted of 100 calls. Determine 95 pct limits. Is the process stable(i.e., in control)? explain.
The Web-based company Henrietta Balloons has a goal of processing 96% of its orders on the same day they are received. If 95 out of the next 100 orders were processed on the same day, would this prove that they are exceeding their goal, using a 90%..
When a result is not extreme enough to reject the null hypothesis, explain why it is wrong to conclude that your result supports the null hypothesis.
if the risk of a certain disease for non-alcoholics is 7 and the relative risk for this disease in alcoholics versus
During 2007, sales of new, privately owned homes in the total United States and in the western states were broken down into price categories as follows:
a toll bridge charges 1.00 for passenger cars and 2.75 for other vehicles. suppose that during daytime hours 60 of all
Determine the critical value for a left-tailed test of a population mean at the α=0.005 level of significance based on a sample size of n = 30
By using the normal distribution to approximate the desired probability.
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