Suppose there are 5,547 daily observations for the returns of stocks in the Fortune 500 portfolio. The portfolio average return is 0.0213 with a standard deviation of 0.7832. Formally state the hypothesis test on whether the return on the Fortune 500 portfolio is different from 0. Use a two-tailed test. Using the confidence interval method, test your hypothesis at the 90% confidence level. Explicitly state the results of the test. Using the t-test method, determine at which conventional significance levels you can reject the null hypothesis and refute your friend’s claim (if any).

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