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Sketch a histogram of these data and give the modal class.
60 62 63 64 64 65 65 65 65 65 65 66 66 66 66 66 67 67 67 68 68 68 70 70 70 71 71 72 72 72 73 73 73 73 75 75 75 75 76 76 77 77 77 77 77 79 82 83 85 85 87
Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment.
What is a 90% confidence interval for the mean monthly expenditure on gasoline per household in Slippery Rock?
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
Using the dataset, produce a graph of per capita GDP for Argentina, China, and Canada from 1965 to 1995. Is inequality between these countries increasing?
A safety engineer claims that only 40% of all workers wear safety helmets when they eat lunch at the workplace. Assuming that his claim is right, find the probability that at most 4 out of 6 workers randomly chosen will be wearing their helmets wh..
The mean and the standard deviation of a sample of 100 bank customer waiting times are 5.46 and 2.475 minutes, respectively. a) Assuming the distribution is bell-shaped, calculate the waiting time intervals containing 68% and 95% of bank customer w..
A population of scores forms a normal distribution with a mean of μ = 40 and a standard deviation of σ =12.
A car rental company has determined that the probability a car will need service work in any given month is 0.2. The company has 900 cars.
Last year the average deposit for all 10,000 clients was $25,000 with a standard deviation of $30,000. Do you think a small sample of 25 is enough to give them the margin of error they want? If not, how large a sample do you suggest they need to t..
Tom Sevits is the owner of the Appliance Patch. Recently Tom observed a difference in the dollar value of sales between the men and women he employs as sales associates.
A random sample of 50 households revealed a mean of $112,000 and a standard deviation of $40,000. What is the standard error of the mean?
Why might supposition of normal population be doubtful? Problem arises when?
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