During the 2009 holiday season, 436 randomly sampled American adults were surveyed regarding their average spending on Black Friday. A 95% confidence interval based on this sample is ($80.31,$89.11). (a) What is the margin of error of the interval? (b) A local news anchor claimed that the average spending was $100. Has this claim statistical evidence or not? Explain. (c) Determine the sample mean x and the sample standard deviation s of the sample.

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