The following table lists the market share of the four


Question: The following table lists the market share of the four firms in a particular industry in 2010 and total sales for each firm in 2011.

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a. Specify the competing hypotheses to test whether the market shares in 2010 are not valid in 2011.

b. Calculate the value of the test statistic.

c. At the 1% significance level, what is the critical value?

d. Do the sample data suggest that the market shares changed from 2010 to 2011?

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Basic Statistics: The following table lists the market share of the four
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