[Steps Shown] Outline the changes to all calculations in Q1 if, instead of knowing σ = 15, we have to estimate this quantity from the sample data, and our
Question: Outline the changes to all calculations in Q1 if, instead of knowing σ = 15, we have to estimate this quantity from the sample data, and our estimate is s = 18.
Repeat the test of the hypothesis in Q1, and decide whether your conclusions change in these circumstances.
Deliverable: Word Document 
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Descriptive Statistics Calculator of Grouped Data - MathCracker.com