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A researcher is interested in estimating the average salary of police officers in a large city. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to get the desired information and to be accurate within $200?
Estimate the probability the store will gross over $850 a) Fewer than 5 out of 10 business days.
Random sample of round-trip discount fares on this route last month gives: At .01 significance level can we conclude that mean fare has increased? Determine the p-value?
A certain airplane has two independent alternators to provide electrical power.
Compute the standard error of estimate, and interpret its meaning.
Mean score on 10 item test for all students enrolled in a Traditional course was 9.64. A random sample of 41 students in Project Course is given same test
Can we conclude that car size is dependent on marital status? YES or NO (circle one)
Calculate the appropriate disease frequency rate. Show your work. The cumulative incidence rate in a population of 100,000 people where 9 new cases of disease were reported within 1 year.
prevent coronary artery vasoconstriction and the attendant reduction in blood flow to the heart and mechanical function.
The carpeting department supervisor claims that the average number of days between the receipt of a complaint and its resolution is 20 days or less.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. State the decision rule.
Assume the data have bell shaped distribution with a mean of 30 and a standard deviation of 5. Employ the empirical rule to determine the percentage of data within each of the following ranges: 20 to 40, 15 to 45, and 25 to 35.
A psychologist studied self-esteem scores and found the data set to be normally distributed with a mean of 50 and a standard deviation of 6. A raw score of 47 is associated with what percentile?
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