Question

Assume that the following confidence interval for the difference in the mean length of male​ (sample 1) and female babies​ (sample 2) at birth was constructed using independent simple random samples. What does the confidence interval suggest about the difference in length between male babies and female​ babies?

−0.2 in. < μ1- μ2 <1.7 in.
a female babies are longerb male babies are longerc there is no difference in the length between male and female babies

Answer 1

c. There is no difference in the length between male and female babies

Explanation:

When a confidence interval contains a zero, then there is no statistically significant different between the two group means because this means that there is a zero in the difference between the groups and a zero in the difference means there is no difference.