Step 2: Find the test statistic. t = (x-μ) / (s/n) = (14-15) / (3/20) = -1.49. Step 3: Find the p-value for the test statistic. To find the p-value by hand, we need to use the t-Distribution

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The p-value calculator will output: p-value, significance level, T-score or Z-score (depending on the choice of statistical hypothesis test), degrees of freedom, and the observed difference. For means data it will also output the sample sizes

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3. Use a t-distribution table to find the associated p-value. Once you've calculated the value of the test statistic t, you can find the associated p-value by referring to a t