Prior to the virus outbreak in Maine, a one-pound box of pasta cost $1.09 cents. You sample 24 grocery stores and find that the average cost is X-bar = $1.39 cents with a standard deviation s = 12 cents (or $0.12).

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Prior to the virus outbreak in Maine, a one-pound box of pasta cost $1.09 cents. You sample 24 grocery stores and find that the average cost is X-bar = $1.39 cents with a standard deviation s = 12 cents (or $0.12). You want to see if this is significantly different from the cost before the outbreak, so you test the following hypotheses: Ho: μ = 1.09 and Ha: μ ≠ 1.09. What is the standard error of the mean? Round your answer to three decimal places. 

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