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Records show that in a random sample of 100 hours a machine produced an hourly average of 678 articles with a standard deviation of 25. After a safety device was installed, in a random sample of 500 hours the machine produced an hourly average of 674 articles with a standard deviation of 5. Pointing to the drop of 4 articles per hour in the sample mean, management claimed the safety device was reducing production. The union countered that the drop of 4 articles was "merely statistical fluctuation."
(a) To objectively summarize the evidence on whether production is left unchanged, calculate the prob-value.
(b) If the arbitration board decides that a = 1 % is a fair level of significance (type I error), do they rule in favor of management or union?
In what situations might a taxpayer make a 50% election on a charitable contribution of long-term capital gain property?
1 suppose that 5 of cereal boxes contain a prize and the other 95 contain the message sorry try again. if a person
suppose mary scores 82 on a test while her class had a mean of 72 and a standard deviation of 5.what are marys z
the scores on an old pinball machine located in the basement of the student center are normally distributed with a mean
Let Y= 1 if the two coins show the same thing (i.e., both heads or both tails), with Y= 0 otherwise. Let Z = X + Y, and W =XY.
Standard deviation versus standard error. Explain the difference between the standard deviation of a sample and the standard error of a statistic such as the sample mean.
In Example 6.9 (page 373), we found that the average student debt has risen between 1997 to 2002. In computing the difference, we did not adjust for differing values of the dollar.
Do the results differ from the standard two-sample t test with pooled variance? Are the p-values similar?
Estimate a regression model with trend & season dummies to forecast the next year sales:
Create a Pivot table for value of $Amount that cross-tabulates by AcctType and Branch. What is Average value of Savings accounts opened at the Westside Branch
A psychologist claims that more than 6.3% of the populations suffer from professional due to greate shyness. Categorize the Type II error in this context.
How can the company do this and obtain independent samples? Explain in detail
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