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A computer password consists of four characters. The characters can be one of the 26 letters of the alphabet. Each character may be used more than once.
How many different passwords are possible?
Assume that a study of 500 randomly selected school bus routes showed that 480 arrived on time. Is it "significant" for a school bus to arrive late?
Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone.
When creating a 99% confidence interval for the true average difference in cholesterol levels by the drug, what is the margin of error?
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
The hypothesis that the samples came from identical populations cannot be rejected, the T value is 16.5 greater that the lower limit.
An independent researcher has decided to study variations in TV viewing habits among three American cities. She has managed to randomly sample households in Chicago, Atlanta, and Minneapolis and gather data on the daily "on" times for households o..
Make an interval estimate the population means score for the daycare children so that you are 95% confident that the true mean is in your interval.
Describe the factors that might cause variation in weight of Tootsie Rolls during manufacture.
In studying the performance of the comapany's stock investments over the past year, the research manager of a mutual fund company finds that only 43% of the stocks returned more than the rate that had been expected at the beginning of the year.
Automobile manufacturers are interested in the difference in reaction times for drivers reacting to traditional incadescent lights and to LED lights.
What is the predicted GPA if a person watches 12 hours of television per week?
Test for single mean - What do you conclude - Compute z and P
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