Question: A researcher notes that the null hypothesis of a mean difference = 0 points is contained within the 95% confidence interval: 95% CI 6.34, +2.02.

A researcher notes that the null hypothesis of a mean difference = 0 points is contained within the 95% confidence interval: 95% CI −6.34, +2.02. Based on this result, which of the following is true?

a. The decision is to reject the null hypothesis: We estimate that points shifted between 2.02 above and 6.34 points below the population mean difference.

b. The decision is to fail to reject the null hypothesis: We conclude that there is no effect in the population.

c. No decision could be made: It is not possible to infer significance and effect size from a confidence interval.

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