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1. The following data is the annual income (in $1,000s of U.S. dollars) taken from nine randomly chosen students in the Hopkins Internetbased MPH program:3 37 102 34 12 111 56 72 17 33
a) Calculate the sample mean incomeb) Calculate the sample median incomec) Calculate the sample standard deviation of these incomesd) What population could this sample represent?e) Which would change by a larger amount-the mean or median-if the 34 were replaced by 17, and the 12 replaced by a 31?
a survey of a simple random sample of university alumni finds that six months after graduation 75 of the 100 liberal
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The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
Random samples of 2009 pickup trucks with 4 cylinder, 5 cylinder, 6 cylinder, and 8 cylinder engines were obtained. Each pickup truck was tested for miles per gallons in highway driving
suppose the probability distribution x number of jobs held during the past year for students at hfcc is as followsx 0
question two concentric circles are such that a chord of the larger 36 cm long is trisected by the smaller. the sum of
explain what problems arise in trying to make conclusions based on a survey mailed to the subscribers of a specialty
an airline company is considering a new policy of booking as many as 281 persons on an airplane that can seat only 270.
Marketing firm asked the random set of married and single men as to how much they were eager to spend for vacation. At alpha= .05, is a difference in two amounts?
A recent national survey found that high school students watched an average (mean) of 7.5 DVDs per month with a population standard deviation of .60.
Calculate separate confidence intervals for the numbers of days absent for Clinic A and Clinic B, respectively.
If you select a random sample of 16 customers: what is the probability that the mean time spent per customer is at least 3 minutes?
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