Assume that we want to construct a confidence interval. Do one
of the following, as appropriate: (a) find the critical
value
tĪ±/2,
(b) find the critical value
zĪ±/2,
or (c) state that neither the normal distribution nor the
t distribution applies.Here are summary statistics for randomly
selected weights of newborn girls:
n=203,
x=31.3
hg,
s=6.9
hg. The confidence level is
99%.
Select the correct choice below and, if necessary,
fill in the answer box to complete your choice.
A.
tĪ±/2=nothing
(Round to two decimal places as needed.)
B.
zĪ±/2=nothing
(Round to two decimal places as needed.)
C.
Neither the normal distribution nor the t distribution
applies