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Qusetion: Cars. A survey of autos parked in student and staff lots at a large university classified the brands by country of origin, as seen in the table.
Driver
Origin Student Staff
American 107 105
European 33 12
Asian 55 47
a) What percent of all the cars surveyed were foreign?
b) What percent of the American cars were owned by students?
c) What percent of the students owned American cars?
d) What is the marginal distribution of origin?
e) What are the conditional distributions of origin by driver classification?
f) Do you think that the origin of the car is independent of the type of driver? Explain.
Following are speeds of 40 cars clocked by radar on a particular road in a 35-mph zone on a particular afternoon; Make (a) a frequency table, (b) a histogram, and (c) a frequency polygon. Then describe the general shape of the distribution.
As it is a 2 × 2 table, try also two-tailed two-sample z test for π 1 = π 2 and verify that z 2 is same as your chi-square statistic. Which test do you prefer? Explain why?
Suppose the population mean is 50.6 pounds with a population standard deviation of 1.62 pounds. Suppose we take thousands of samples with a sample size of 5.
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as brian is leaving for college his parents give him a car but warn him that they would take the car away if he gets 6
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The company believes that the price elasticity for this product is about -2.5. If it decreases its price to $63, what should be the quantity sold? Will the revenue increase? Why
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