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Explain briefly and in nontechnical language what "a significant difference (P < 0.01)" means. (b) Explain clearly and briefly what "95% confidence" means. (c) Is this study good evidence that requiring job training of all welfare mothers would greatly reduce the percent who remain on welfare for several years?
What is the probability that more than one machine is in the system? Probability that more than two are broken and waiting to be repaired or being serviced? More than three? More than four?
Complete the test at the 5% level of significance.
Farley purchases and pays for merchandise 60% in the month of acquisition and 40% in the following month. Accounts payable is used only for inventory acquisitions. How much cash will Farley receive during November?
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
If random sample of size n = 16 are selected, can we say anything about the xbar distribution of sample means?
At the .05 significance level, can we conclude that the guideline is still reasonable?
Just, a case of food poisoning was traced to a particular restaurant chain. The source was identified and corrective actions were taken to make sure that the food poisoning would not reoccur. In spite of the response from the restaurant chain, man..
Conduct the following test using 95% level of confidence.
Give the 90% confidence interval for the mean score in the population of all young women.
A sample of 10 persons is used to measure the effectiveness of two massage techniques. The effectiveness of the techniques is measured by the number of days that pass by before the subjects feel the need for another massage session.
A professor wants to conduct a study to know whether the grades she gives to her students affect their evaluations of her. She teaches four classes of ten students each.
Construct a 96 percent confidence interval for the mean weight of all firefighters six months after the exercise rooms were installed.
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