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According to Nielsen//NetRatings, the average visitor to the American Greetings website spends 11.85 minutes at the site.
Assuming this finding to be based on a simple random sample of 20 visitors to the site, with a sample standard deviation of s = 3.0 minutes, and from a population of visiting times that is approximately normally distributed, construct and interpret the 98% confidence interval for the population mean.
Given this confidence interval, would it seem very unusual if another sample of this size were to have a mean visiting time of 13.0 minutes?
seventy percent of the bicycles sold by a certain store are mountain bikes. among 100 randomly selected bike purchases
48 or fewer will answer the question correctly. What is the z-score that you should look up in the z-table to find the desired probability?
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles.
Are the advertising dollars spent by a company related to total sales revenue? The following data represent the advertising dollars and the sales revenues for various companies in a given industry during a recent year. Construct a scatter plot of ..
The Penguin Company employs 200 men and 50 women. Of the male employees, 140 work in the plant, 20 are in the office, and 40 are field salesmen.
Do you agree or disagree that the lottery is a tax on people who are bad at math?
the father of a junior high school student wants to determine the most popular book among junior high students. select
if a simple pearson correlation value .685 what percentage of variance is accounted for?a. 69b. 35c. 47d.
In past, mean processing time was 45 days. At 0.05 level of significance, is there evidence that mean processing time has changed from 45 days?
At a local supermarket the monthly customer expenditure follows a normal distribution with a mean of $495 and a standard deviation of $121.
zingos grocery store claims that customers spend an average of five minutes waiting for service at the stores deli
construct an 80 confidence interval to estimate the population mean when x 125 and s 32 for the following sample
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