The shares of the U.S. automobile market held in 1990 by General Motors, Japanese manufacturers, Ford, Chrysler, and other manufacturers were, respectively, 35%,21%,25%,12%, and 7%. Suppose that a new survey of 1,000 new-car buyers shows the following purchase frequencies: Deplute Click here for the Excel Data File (a) Show that it is appropriate to carry out a chi-square test using these data. (b) Determine whether the current market shares differ from those of 1990. Use a=05. (Round your onswer to 3 decimal places.) (b) Determine whether the current market shares differ from those of 1990 . Use a=05. (Round your answer to 3 decimal places