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Airline safety. Even though commercial airlines have excellent safety records, in the weeks following a crash, airlines often report a drop in the number of passengers, probably because people are afraid to risk flying.
a) A travel agent suggests that since the law of averages makes it highly unlikely to have two plane crashes within a few weeks of each other, flying soon after a crash is the safest time. What do you think?
b) If the airline industry proudly announces that it has set a new record for the longest period of safe flights, would you be reluctant to fly? Are the airlines due to have a crash?
Determine the standard deviation of difference between Sarah's and Richard's scores?
test the claim the population of sopmohores college students has a mean grade point average of 2.25 versus a mean grade
The average SAT score at a regional university is u=710, and standard deviation q=60. Assume that the university has a normal distribution convert a student score X=770 into a z-score.
At the .01 significance level, is there a difference in the mean number of times men and women order take-out dinners in a month? What is the p-value?
a newspaper in a large midwestern city reported that the national association of realtors said that the mean home price
chicagos treadway tires dealer must order tires from its national warehouse. it costs 10000 to place an order and 400
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
The Ohio Department of Agriculture tested 203 fuel samples across the state in 1999 for accuracy of the reported octane level. For premium grade, 14 out of 105 samples failed
Suppose three unfair coins are tossed, a nickel, a dime, and a quarter. The probability of tossing a head on the nickel is 0.35; the probability of tossing a head on the dime is 0.20
She samples a group of 100 new fathers and finds that their mean is 64.5. What is the variance on this questionnaire in the general population?
one thousand raffle tickets are sold for 2.00 each. one grand prize of 800 and two consolation prizes of 100 each will
Discuss the role of sensitivity analysis in LP. Under what circumstances is it needed, and under what conditions do you think it is necessary?
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