If the 95% CI for the difference in recovery times is (2.1 days to 4.5 days), what is the appropriate decision regarding a null hypothesis of zero difference?
Answer
Reject the null hypothesis because the hypothesized value of zero is entirely excluded.
Since the calculated interval (2.1 to 4.5 days) does not contain zero, the null hypothesis stating no difference can be rejected at the $\alpha = 0.05$ significance level.
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