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Assume that a set of test scores is normally distributed with a mean of 78 and a standard diviation of 10. What percentage of scores lie between 78 and 97?
Of the students who scored around 50 on the midterm, about what percentage were in the top 25% of the class on the final?
How many students should be surveyed if a 90% confidence interval is desired and the margin of error is to be only 3%?
A 90% confidence interval runs from 65.891 to 70.109 for the mean daily number of credit card applications that are rejected from a computer system and must be handled manually.
Using smoothing constant of w = .80, compute the value of exponentially smoothed series in 1983.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Discuss at least three reasons why these predictions may not be accurate and offer three ways in which you can increase the likelihood of accurately predicting your customers' purchases.
The dying rate in an industrial process is department of many factors and varies according to the following distribution.
Experience raising New Jersey Red chickens revealed the mean weight of the chickens at five months is 4.35 pounds. The weights follow the normal distribution.
Can the researcher conclude that humidity has a significant effect on eating behavior? Use a two-tail test with α = .05.
A trucking firm suspects that the mean lifetime of a certain tire it uses is less than 35000 miles. To check the claim the firm randomly selects and test 54 of these tires and gets a mean lifetime of 34,570
Assuming that = 119.5 ng.ml, test the claim that the mean cotinine level of all smokers is equal to 200.0 ng/ml. Use a 0.05 significance level.
Determine the mean and the standard deviation of the sample.
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