Refer to Problem 24. The following table provides last year's cheese consumption, in pounds, for 35 randomly selected Americans.

a. At the 10% significance level, do the data provide sufficient evidence to conclude that last year's mean cheese consumption for all Americans has increased over the 2001 mean? Assume that σ = 6.9 lb. Use a z-test.
b. Given the conclusion in part (a), if an error has been made, what type must it be? Explain your answer.

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