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In one region, the February energy consumption levels for single-family homes were found to be normally distributed with a mean of 950 KWh and a standard deviation of 218 KWh. For a randomly selected home, find the probability that the February energy consumption level is greater than 1,000 KWh.
As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. At = .05, what is the test value?
Flying over the western states with mountainous terrain in a small aircraft is 40% riskier than flying over similar distances in flatter portions of the nation. Find the probability of no accidents in 100,000 flight operations.
A recent article in Vitality magazine reported that the mean amount of leisure time per week for American men is 40.0 hours. You believe this figure is too large and decide to conduct your own test.
The speed limit on Interstate 75 around Findlay, Ohio, is 65 mph. On a clear day with no construction, the mean speed of automobiles was measured at 63 mph with a standard deviation of 8 mph.
Find a 90% confidence interval for the population mean salary of such personnel. What is the margin of error.
Assume the cholesterol levels of adult American women are normally distributed with a mean of 190 mg/dL and a standard deviation of 26 mg/dL. What percent of adult women do you expect to have cholesterol levels at least 200 mg/dL?
For a study that consists of personal interviews with participants (rather than mail or phone surveys), explain why simple random sampling might be less practical than some other sampling methods.
Find out the Optimum solution using the given data. Consider the following linear programming problem. Illustrate what is the optimum solution to this problem?
Construct a 95% confidence intervalfor the population proportion of positive drug tests. Why is the normality assumption not a problem despite the very small value of p?
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02 for the October 26 evening showing of the same movie
A marketing survey is taken among fast food customers to determine their preference for hot dogs or pizza. Of the 200 respondents selected,
Construct a 90% confidence interval for the population proportion p . Does your result agree with your conclusion in part (a)?
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