Homework SourseThe shares of the US automobile market held in 1990 by Gener
The shares of the U.S. automobile market held in 1990 by General Motors, Japanese manufacturers, Ford, Chrysler, and other manufacturers were, respectively, 38%, 29%, 19%, 10%, and 4%. Suppose that a new survey of 1,000 new-car buyers shows the following purchase frequencies:
| The shares of the U.S. automobile market held in 1990 by General Motors, Japanese manufacturers, Ford, Chrysler, and other manufacturers were, respectively, 38%, 29%, 19%, 10%, and 4%. Suppose that a new survey of 1,000 new-car buyers shows the following purchase frequencies:
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Solution
a) the last expected value is less than 5. Hence it is pooled with the previous value and then each expected value is >=5.
b)chi square is 12.459
Reject H0. The current market shares differ form those of 1990.
(Excel is used to do the analysis.)
