Answer Happy

Listed below are speeds​ (mi/h) measured from traffic on a
busy highway. This simple random sample was obtained at​ 3:30
P.M. on a weekday. Use the sample data to construct 95​%
confidence interval estimate of the population standard
deviation.
62
63
63
55
63
55
59
58
59
70
60
67
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Question content area bottom
Part 1
The confidence interval estimate is
enter your response here
​mi/h<σ<enter your response here
​mi/h.
​(Round to one decimal place as​ needed.)
Part 2
Does the confidence interval describe the standard deviation for
all times during the​ week? Choose the correct answer
below.
A.
Yes. The confidence interval describes the standard deviation
for all times during the week.
B.
No. The confidence interval is an estimate of the standard
deviation of the population of speeds at​ 3:30 on
a​ weekday, not other times.