Answer Happy

A known data set represents a random sample of 186 cases of
mothers and their newborns in Florida over a year. We are
particularly interested in two variables: weight and smoke, which
is provided in the figure below. The weight variable represents the
weights of the newborns and the smoke variable describes which
mothers smoked during pregnancy. We would like to know, is there
convincing evidence that newborns from mothers who smoke have a
different average birth weight than newborns from mothers who don't
smoke? The researcher will use a significance level of alpha =
.01.
a) Is this a left-tailed, right-tailed, or two-tailed
test? Explain.
b) Interpret the p-value.
c) Compare the p-value to the significance level. Are
these results significant?
d) Interpret the results of this study for a
non-statistical audience.
Smoker Non-Smoker Sample Size 82 104 Stand Dev 1.23 1.76 Mean 6.64 7.27 t -2.75 Significance Level/P-value 0.006