Outcome (a): the confidence interval is completely to the left
of zero. It can be concluded, with the specified level of
confidence (normally 95%), that the result for scenario 1 is
less than the result for scenario 2.
• Outcome (b): the confidence interval includes zero. It can be
concluded, with the specified level of confidence, that the
result for both scenarios are not significantly different.
• Outcome (c): the confidence interval is completely to the right
of zero. It can be concluded that the result for scenario 1 is
greater than the result for scenario 2.