Question: Based on the confidence intervals for these data, and assuming a null hypothesis that there is no mean difference between these groups in the population,

Based on the confidence intervals for these data, and assuming a null hypothesis that there is no mean difference between these groups in the population, what can we infer about the decision for a null hypothesis significance test at a .05 level of significance for a two-tailed test?

a. The decision would have been to fail to reject the null hypothesis.

b. The decision would have been to reject the null hypothesis.

c. It is not possible to infer significance from a confidence interval.

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