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2. You are considering investing in a company. The company claims for the past few years the average monthly return on such an investment has

2. You are considering investing in a company. The company claims for the past few years the average monthly return on such an investment has been $870 with a standard deviation of $50. You sample 30 investors and determine the sample average return to be $855. Using a .05 level of significance would you conclude that the true average return is different from $870? Explain your conclusion

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