Here are summary statistics for randomly selected weights of newborn girls:

nequals

159,

x overbar

equals29.5

hg,

sequals

6.2

hg. Construct a confidence interval estimate of the mean. Use a

98

%

confidence level. Are these results very different from the confidence interval

27.7

hgless than

muless than30.5

hg with only

12

sample values,

x overbar

equals29.1

hg, and

sequals

1.8

hg?