In Exercise 2.44 you learned that stock screeners are automated tools used by investment companies to help
Question:
a. Find a 90% confidence interval for the average annualized percentage return on investment of all stock screeners provided by AAII. Interpret the result.
b. Recall that a negative annualized return reflects a stock portfolio that performed worse than the S&P 500. On average, do the AAII stock screeners perform worse or better than the S&P 500? Explain.
c. What assumption about the distribution of the annualized percentage returns on investment is required for the inference, part b, to be valid? Is this assumption reasonably satisfied?
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Statistics For Business And Economics
ISBN: 9780134506593
13th Edition
Authors: James T. McClave, P. George Benson, Terry Sincich
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