From 58 randomly selected retail sales, an analyst finds that the mean amount spent is ($26.05) with

Question:

From 58 randomly selected retail sales, an analyst finds that the mean amount spent is $$26.05$ with a standard deviation of $$10.20$ and is approximately Normally distributed. Test the hypothesis that the mean is still $$24.85,$ as it was last year, against the alternative that it has increased.

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