Question

The data shown to the right represent the age​ (in weeks) at which babies first​ crawl, based on a survey of 12 mothers. Complete part (b) below.

52		30		44		35
47		37		56		26
35		30		39

(b) Construct and interpret a 95​% confidence interval for the mean age at which a baby first crawls. Select the correct choice and fill in the answer boxes to complete your choice.

​(Round to one decimal place as​ needed.)

A.The lower bound is ?

weeks and the upper bound is ? weeks. We are 95​% confident that the mean age at which a baby first crawls is outside of the confidence interval.

B.The lower bound is ? weeks and the upper bound is ? weeks. We are 95​% confident that the mean age at which a baby first crawls is between these two values.

Answer 1