This is the two tailed test .
n = 21
df = 21 - 1 = 20
/2
= 0.005 / 2 = 0.0025
Critical value =
3.153
Test statistic = (-28 *
21 / 32.1) = 3.997
You wish to test the following claim (H) at a significance level of a = 0.005....
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