Question
A random sample of 23 items is drawn from a population whose standard deviation is unknown....
A random sample of 23 items is drawn from a population whose
standard deviation is unknown. The sample mean is x¯x¯ = 770 and
the sample standard deviation is s = 25. Use Appendix D to
find the values of Student’s t.
(a) Construct an interval estimate of μ
with 95% confidence. (Round your answers to 3 decimal
places.)
The 95% confidence interval is from to
(b) Construct an interval estimate of μ
with 95% confidence, assuming that s = 50. (Round
your answers to 3 decimal places.)
The 95% confidence interval is from to
(c) Construct an interval estimate of μ
with 95% confidence, assuming that s = 100. (Round
your answers to 3 decimal places.)
The 95% confidence interval is from to
(d) Describe how the confidence interval changes
as s increases.
-
The interval stays the same as s increases.
-
The interval gets wider as s increases.
-
The interval gets narrower as s increases.
Homework Answers
Answer #1
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