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The internal auditing staff of a local manufacturing company performs a sample audit each quarter to estimate the proportion of accounts that are current (between 0 and 60 days after billing). The historical records show that over the past 8 years 70 percent of the accounts have been current. Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
Determine the probability that pregnancy will (a) last more than 300 days; (b) less than 240 days; (c) between 250 and 282 days.
Estimate the true proportion of college students who believe in the possibilty of haunted places with 99% confidence.
If the population mean is 36, are the serial killers significantly more introverted at the .05 level? Perform the appropriate one-tailed test.
How much variability will you have if you predict sales with this model?
Determine probability of waiting less than 12 minutes between successive speeders. By using cumulative distribution function of X.
One of the questions asked on the survey to purchasing agents is: Do you think the economy is expanding? Last month, of the 300 responses 160 answered yes to the question.
State the alternative hypothesis in statistical terms. Define the critical region by drawing the distribution and labeling the z-critical value.
If a technical assistant is randomly selected, what is the probability that she would like to have MAC, given that she would like to have a PC as well?
What proportion of the first 70 digits in the table are 0s (there are 40 digits in line 101 followed by the first 30 in line 102)?
Construct a 98 percent confidence interval estimate of the difference between the two sample means (Please show work).
Using random numbers of 0.1567, 0.9823, 0.3419, 0.5572 and 0.7758, compute the time required for each of five simulated maintenance checks of the airplane's landing gear.
The mean of a normal probability distribution is 60; the standard deviation is 5.
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