The t-table indicates that the critical values for our test are -2.086 and +2.086. Use both the positive and negative values for a two-sided test. Your results are statistically significant if your

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critical value: The critical t t -value for a given confidence level c c and sample size n n is obtained by computing the quantity tα/2 t α / 2 for a t t -distribution with n−1 n − 1

For a one-tailed test, divide the α values by 2. For example, the last column has an α value of 0.005 and a confidence interval of 99.5% when conducting a one-tailed t -test. This

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