A random sample of 15 items is drawn from a population whose standard deviation is unknown. The sample mean is I= 760 and the sample standard deviation is s = 20. Use Appendix D to find the values of Student's t. (a) Construct an interval estimate of µ with 99% confidence. (Round your answers to 3 decimal places.) The 99% confidence interval is from [ ] to (b) Construct an interval estimate of u with 99% confidence, assuming that s = 40. (Round your answers to 3 decimal places.) The 99% confidence interval is from [ to (c) Construct an interval estimate of u with 99% confidence, assuming that s = 80. (Round your answers to 3 decimal places.) The 99% confidence interval is from to

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A random sample of 15 items is drawn from a population whose standard deviation is unknown. The sample mean is =760 and the
sample standard deviation is s= 20. Use Appendix D to find the values of Student's t.
(a) Construct an interval estimate of u with 99% confidence. (Round your answers to 3 decimal places.)
The 99% confidence interval is from
to
Book
(b) Construct an interval estimate of u with 99% confidence, assuming that s= 40. (Round your answers to 3 decimal places.)
Ask
The 99% confidence interval is from
to
Print
(c) Construct an interval estimate of u with 99% confidence, assuming that s= 80. (Round your answers to 3 decimal places.)
The 99% confidence interval is from
|to
(d) Describe how the confidehce interval changes as s increases.
The interval stays the s
The intervalgets wider as s increases
The interval gets narrower as s increases
< Prey
6 of 10 E
Next >
Retake
Use Photo
Transcribed Image Text:Connect x appendixd.jpg (9 Connect - Result x A (MOBILE) Shim Check my work View previous atte A random sample of 15 items is drawn from a population whose standard deviation is unknown. The sample mean is =760 and the sample standard deviation is s= 20. Use Appendix D to find the values of Student's t. (a) Construct an interval estimate of u with 99% confidence. (Round your answers to 3 decimal places.) The 99% confidence interval is from to Book (b) Construct an interval estimate of u with 99% confidence, assuming that s= 40. (Round your answers to 3 decimal places.) Ask The 99% confidence interval is from to Print (c) Construct an interval estimate of u with 99% confidence, assuming that s= 80. (Round your answers to 3 decimal places.) The 99% confidence interval is from |to (d) Describe how the confidehce interval changes as s increases. The interval stays the s The intervalgets wider as s increases The interval gets narrower as s increases < Prey 6 of 10 E Next > Retake Use Photo
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