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The owner of a computer repair shop has determined that their daily revenue has mean $7200 and deviation $1200. The daily revenue totals for the next 30 days will be monitored. What is the probability what the mean daily revenue for the next 30 days will exceed $7500?
A partial computer output from a regression analysis as follows. The regression equation is:
You are given the sample mean and the sample deviation, Use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider?
The mean maximum oxygen uptake for elite athletes has been found to be 80 with a standard deviation of 8.1. Assume that the distribution is approximately normal.
Find a research article and clearly define both the null and directional hypothesis that was or could have been tested during the statistical analysis of the data.
The researchers claimed that of those who completed the program, 85% improved. What possible confounds can you identify in this study?
Determine the sum of these probabilities , and why is the number less than 1
What is the estimate of the proporation of employees who do not use the ATM in a month? Develop a 95 percent confidence interval for the mean number of transactions per month.
Given a binomial distribution with n=29 and p=0.83, would the normal distribution provide a reasonable approximation? Why or why not.
A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution. What is the standard deviation (in minutes)?
If three systems are installed, what is the probability that at least one of the systems will detect the attack? Would you recommend that multiple detection systems be used? Explain.
The sample mean was found to be 194 pounds with a standard deviation of 11.2 pounds. What percentage of men have weights between 175 and 2235 pounds?
Plot fitted values against residuals. Does this plot point out any problems with homoscedasticity?
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