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The United States Postal Service report 95 percent of first class mail within the same city is delivered within two days of the time of mailing. Six letters are randomly sent to different locations.
a. What is the probability that all six arrive within two days?
b. What is the probability that exactly five arrive within two days?
c. Find the mean number of letters that will arrive in two days.
d. Compute the variance and standard deviation of the number that will arrive within two days.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
Find the area under the normal distribution curve to the right of z = -1.03.
Suppose each employee in the company receives a $3000 raise for next year (each employee's salary is increased by $3000). The interquartile range of the salaries will
Such things as historical documents, newspaper reports, TV and radio broadcasts, when used in research, represents
The mean of a sample is 22.5. The mean of 1000 bootstrapped samples is 22.491. The bias of the bootstrap mean is
How large a sample would be necessary to estimate the population proportion with a margin of error of 0.05 at 95% confidence?
Change the frequencies to percentages - is there a group more likely to get high salaries.
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
A company tracked the number of complaints it received during the first 6 months of last year, as shown in the following table:
The population of lengths of aluminium-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.
What is the mean and standard deviation of the sampling distribution when we take all samples of size25?
A normal distribution with a mean of 55 and a standard deviation of 6 is evaluated to solve a business problem.
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