Statistics Solutions

(See Steps) Streetlnsider.com reported 2002 earnings per share data for a sample of major companies (February 12, 2003). Prior to 2002, financial analysts

Question: Streetlnsider.com reported 2002 earnings per share data for a sample of major companies (February 12, 2003). Prior to 2002, financial analysts predicted the 2002 earnings per share for these same companies (Burma ’5, September 10, 2001). Use the following data to comment on differences between actual and estimated earnings per share.

Actual Predicted
1.29 0.38
2.01 2.31
2.59 3.43
1.6 1.78
1.84 2.18
2.72 2.19
1.51 1.71
2.28 2.18
0.77 1.55
1.81 1.74
  1. Use a = .05 and test for any difference between the population mean actual and population mean predicted earnings per share. What is the p—value? What is your conclusion?
  2. What is the point estimate of the difference between the two means? Did the analysts
    tend to underestimate or overestimate the earnings?
  3. At 95% confidence. what is the margin of error for the estimate in part (b)? What

would you recommend based on this information?

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