The following table shows the U.S. market share for automotive manufacturers in 2013 according to Autodata. Also
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The following table shows the U.S. market share for automotive manufacturers in 2013 according to Autodata. Also shown is the frequency of car purchases by manufacturer from a random sample of 220 customers during 2014.
Manufacturer Market Share 2013 (%)
Frequency 2014 General Motors 18.5 35 Ford Motor 16.5 37 Toyota 13.7 24 Chrysler 12.2 20 Honda 10.2 17 Other 28.9 87 Total 220
a. Using a = 0.10, perform a chi-square test to determine if the U.S. market share in the automotive industry has changed between 2013 and 2014.
b. Determine the p-value for the chi-square test statistic using Excel and interpret its meaning.AppendixLO1
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