The data below are a random sample of 9 firms chosen from the “Digest of Earnings Reports” in The Wall Street Journal on February 6,1992:
- Find the mean change in earnings per share between 1991 and 1992.
- Find the standard deviation of the change and the standard error of the mean.
- Were average earnings per share different in 1991 and 1992? Test at α = 0.02.
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