On Friday, 11 stocks in a rand om sample of 40 of the roughly 2,500 stocks traded on the New York Stock Exchange advanced; that is, their price of their shares increased. In a sample of 60 NYSE stocks taken on Thursday, 24 advanced. At α = 0.10, can you conclude that a smaller proportion of NYSE stocks advanced on Friday than did on rsday?

On Friday, 11 stocks in a rand om sample of 40 of the roughly 2,500 stocks traded on the New York Stock Exchange advanced; that is, their price of their shares increased. In a sample of 60 NYSE stocks taken on Thursday, 24 advanced. At α = 0.10, can you conclude that a smaller proportion of NYSE stocks advanced on Friday than did on rsday?

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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