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A human resource director wishes to develop an interval estimate for test scores on an exam. She wants the interval to be within 5 points with a 95% confidence level. She does not know the standard deviation, but in previous years the scores have ranged from 34 to 92. How large a sample should she draw?
What advantage does correlation have over a cross-tab?
the umuc daily news reported that the color distribution for plain mampms was 35 brown 20 yellow 20 orange 15 green and
can you reject the auto maker's claim that the mean gas mileage of its sports utility vehicle is 20 miles per gallon? Assume the population is normally distributed.
Researchers for an online market- ing company suggest that new customers who have to become a member before they can check out on the website are very intolerant of long applications. One way to rate an application is by the total number of keystr..
Find the point estimate for mean U.S. household income and the error bound for mean U.S. household income.
Discuss the Roman division of social classes. How did Rome attempt to reconcile these differences in law and culture?
question consider that you are a line manager in your current corporation. there is a 0.50 probability that you will
Conduct a two-sided hypothesis test to determine whether there is any evidence the mean monthly water usage is different from 714 cubic feet. Use a = 0.05.
What does standard deviation measure? In looking at the standard deviations of the "with fireplace" and "without fireplace" selling prices, one is much larger than the other.
Which of the following are random or systematic sources of error? (a) Power failure during equipment test
Compare your best difference to the result from an ordinary two-sample t-test between these groups. Comment the difference.
A manufacturer claims that the mean lifetime of its light bulbs is 55 months. The standard deviation of these lifetimes is 6 months. Twenty-two bulbs are selected at random, and their mean lifetime is found to be 56 months.
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