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Gamma Corporation is considering the installation of governors on cars driven by its sales staff. These devices would limit the car speeds to a preset level, which is expected to improve fuel economy. The company is planning to test several cars for fuel consumption without governors for 1 week. Then governors would be installed in the same cars, and fuel consumption will be monitored for another week. Gamma Corporation wants to estimate the mean difference in fuel consumption with a margin of error of estimate of 2 mpg with a 90% confidence level. Assume that the differences in fuel consumption are normally distributed and that previous studies suggest that an estimate of sd=3sd=3 mpg is reasonable. How many cars should be tested? (Note that the critical value of tt will depend on nn, so it will be necessary to use trial and error.)
Weights (X) of men in a certain age group have a normal distribution with mean μ = 180 pounds and standard deviation σ = 20 pounds. Find each of the given probabilities:
Does Caffeine Enhance the Taste of Cola?- Soft drink manufacturers claim that caffeine enhances the flavor of cola drinks and that this is why they make caffeinated colas.
What is the minimal number of days a person must watch to be at least 96.8% sure of seeing one or more hawks migrating?
a what is the probability that the space vehicle will have a successful launch?b given that the space vehicle had a
The Statistical Abstract of the United States published by the US Census Bureau reports that the average annual consumption of fresh fruit per person is 99.9 pounds.
An experiment ws designed to estimate the mean difference in weight gain for pigs fed ration A as compared with those fed ration B. Eight pairs of pigs were used. The pigs within each pair were littermates.
Table gives the output for 8 years of an experimental farm that used each of 4 fertilizers. Find the mean output for each fertilizer and the grand mean for all the years and for all four fertilizers
As a requirement of good design the experimenter must choose doses at which the probability of surviving is 0.20, 0.50, and 0.80. What three doses should he choose?
What is the value of the sample proportion p who so they are satisfied with the total cost they pay for their health care? Explain in words what the population parameter p is in this setting.
two years of rainfall acidity data was analyzed at 9 monitoring stations in the eastern united states. for each of two
A sample of 400 Regina households is selected and several variables are recorded. Which ofthe following statements is correct?a) Total household income (in $) is interval level data.b)
What is the probability of observing no successes among the ten treatments? What is the probability of observing 9 or more successes?
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