Modems transmit information across telephone lines from one computer to another. Their speed is rated in baud, the number of bits per second that they can transmit. Because of several technical factors, actual transmission rate varies from fi le to fi le. Anne Evans was shopping for a new 28,800 baud modem. In testing two modems to decide which to purchase, she transmitted 7 randomly chosen fi les with both modems and recorded the following rates (in thousands of baud).
- 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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