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In a given basket of durians, suppose that the weight of each durian follows a Normal distribution with mean 1.5kg and standard deviation 0.2kg. What is the probability that two durians from that basket have a combined weight of more than 3.2kg?
on a test of motor coordination the population of average bowlers has a mean score of 24 with a standard deviation of
Bill Alther is a zoologist who studies Anna's hummingbird (Calypte annaxxUse = 0.10.). (Reference: Hummingbirds, K. Long, W. Alther.)
What is the probability that a simple random sample of automobile insurance policies will have a sample mean within 25 of the popluation mean.
Develop a 96% confidence interval estimate for the population mean starting salary.
Does it appear that the process was in control throughout? If not, determine revised control limits if possible.
Chips ahoy. For the computer chips described in Exercise 10, how many do you expect to test before finding a bad one?
The results are shown here. At Alpha = .01, can it be concluded that the sessions help to improve the students' mathematical skills?
Marital Status. The probability that a randomly chosen 40-year-old woman is divorced is about 0.15. this probability is a long-run proportion based on all the millions of women aged 40.
The probability that a household has a cat is 55%. Sixty percent of all households have a dog. Further, it is known that 25% of all households
Mean and standard deviation. Enter the following data into the Data tab in the One-Variable Statistical Calculator applet: 8, 9, 10, 11, 12. Examine the Statistics tab and report the mean and the standard deviation.
Areas within the forest may differ in soil fertility. Describe a matched pairs design using three pairs of circles that will account for the extra variation.
Derive the labor hiring rule for a profit maximizer firm in the short-run and give a graphical example to explain your argument.
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