Question

Do stock prices of competing companies move together? Below are daily closing prices of two computer services firms (IBM = International Business Machines Corporation, HPQ = Hewlett-Packard Company.
(a) Calculate the sample correlation coefficient (e.g., using Excel or MegaStat).
(b) At α = .01 can you conclude that the true correlation coefficient is not equal to zero?
(c) Make a scatter plot of the data. What does it say?


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  • CreatedAugust 19, 2015
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