A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s², is determined to be 128 Completo parts (a) through (c). ...

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Complete it for n is 40 too pls. 3-3
Tests
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A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s, is determined to be 128 Completo
parts (a) through (c).
(a) Construct a 90% confidence interval for o² if the sample size, n, is 20.
The lower bound is
8.07. (Round to two decimal places as needed.)
The upper bound is
24.04. (Round to two decimal places as needed.)
(b) Construct a 90% confidence interval for o² if the sample size, n, is 30.
The lower bound is (Round to two decimal places as needed.)
H
1
H
More
√i
(1)
Review
Resume
I,
Vi
Clear all
Transcribed Image Text:Tests ctivity K in ok nch er Contents for Success imedia Library chase Options cussions wurse Tools 72°F Sunny A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s, is determined to be 128 Completo parts (a) through (c). (a) Construct a 90% confidence interval for o² if the sample size, n, is 20. The lower bound is 8.07. (Round to two decimal places as needed.) The upper bound is 24.04. (Round to two decimal places as needed.) (b) Construct a 90% confidence interval for o² if the sample size, n, is 30. The lower bound is (Round to two decimal places as needed.) H 1 H More √i (1) Review Resume I, Vi Clear all
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