Math 227 - Statistics » Winter 2021 » Quiz Sec 8.2
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Question #1
Following are the heights in inches of 12 two-year-old apple trees. Assume that the population is normally distributed. 46.1 36.9 35.6 43.9 34.8 34.7 28.6 35.1 54.7 38.0 38.1 40.2 Construct a 99% confidence interval for the population standard deviation σ
A.
(4.32, 13.85)
B.
(4.39, 13.31)
C.
(4.49, 12.79)
D.
(4.20, 12.75)
Question #2
Thirty randomly selected students took the calculus final. If the sample mean was 95 and the standard deviation was 6.6, construct a 99% confidence interval for the mean score of all students.
A.
91.69 < μ < 98.31
B.
92.95 < μ < 97.05
C.
92.03 < μ < 97.97
D.
91.68 < μ < 98.32
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