Construct and interpret a 95% confidence interval for the mean age at which a baby first crawls. (round to one decimal place as needed.)
a. the lower bound is 33.1 weeks and the upper bound is 45.4 weeks. we are 95% confident that the mean age at which a baby first crawls is within the confidence interval.
b. the lower bound is 33.11 weeks and the upper bound is 45.39 weeks. we are 95% confident that the mean age at which a baby first crawls is outside of the confidence