Topic 9 - Statistical Analysis 2 - T-test & Z-test Deal with only one metric question Test the hypothesis about the mean Whether to use T-test or Z-test? Depend on the sample size If n>30, use Z-test If n<30, use T-test Determine whether the test is one-tailed or two-tailed
d.f. = n-1
From the data, can we say that there is no difference on the importance of “easy to use” between groups?
From the data, can we say that there is no difference on the agreement between groups for this statement?