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The accounting department at Weston reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours... Determine the z values for 29 and 34 hrs. What percent of garages take between 32 and 34 hrs to erect.
Criminal activity with guns. Will deter criminal use of these weapons? People from entering Canada, how can we stop gun smugglers?
Throughout history 55% of registered voters actually have cast a ballot. What is the probability that among a group of 28 students who are registered voters more than 19 will vote?
Test the hypothesis. Will you reject or not reject the null hypothesis at α = 0.05
From this small sample, the mean heart rate is 90 beats per minute with a standard deviation of 5. Find a 98% confidence interval for the true mean heart rate of all people with this untreated condition.
The typical homeowner has a utility function equal to the square root of wealth. Will the homeowner retrofit the house, and if so, which insurance policy will the homeowner buy?
Calculate the margin of error that would be used to determine a 95% confidence interval for the mean pulse rate of all women.
Using data on average school grade for first use. Use the t test to conduct a one-tailed test of the null hypothesis, assuming that the average grade is higher for males than for females
There is uneasiness that the users of paper coupons are different from the users of e-coupons (coupons disseminated by means of the Internet).
Over the last year the absentee rate at a large corporation averaged 8.2 days absent with a standard deviation of 6 days. One department with 40 employees had an absentee rate of 12 days per employee.
Test to determine if there is a significant negative relationship between the independent and dependent variable at a = .05 and .01
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
At the .05 significance level, can we conclude that there is a difference in their mean times?
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