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A study of 45 professors showed that the average time they spent creating test questions was 13.0 minutes per question. The standard deviation of the population is 5.8. Which of the following is the 80% confidence interval for the average number of minutes it takes to create a test question?
suppose x has density function x2 for 0 lt x lt 2 and 0 otherwise. find the density function of y x2 - x by computing
A retailer wants to estimate with 99% confidence the number of people who buy at his store. A previous study showed that 15% of those interviewed had shopped at his store.
You have just received an inheritance of $10,000 and you decide that you should invest the money rather than blow it on frivolous items.
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
1. the instructor in a humanities class says that students have a 15 probability of making an a in her class 20
To be fair, the firm is randomly selecting two different employee names to 'win' the tickets. There are 6 secretaries, 5 consultants and 4 partners in the firm. Which of the following statements is not true?
a simple random sample of 25 recent graduates from a particular college gives a sample mean starting salary of 24000
a manufacturer knows that their items have a normally distributed lifespan with a mean of 3.1 years and standard
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages On each page, the mean area devoted to display ads was measured (a display ad is a large block of multicolored illustrations, map..
students enrolled in an introductory statistics course at a university were asked to take a survey that indicated
The Food King Chain employs more than 3,000 people. The worker's ages are approximately normally distributed, with a mean of 31 years and a standard deviation of 4.3 years.
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