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Briefly tell how Statdisk may be used to give even more accurate table
values (Statdisk>> Analysis >> Probability Distributions >> Normal
Distribution).
Week 3 DQ 2
Precisely, in simple language, what is a confidence interval?
What is the difference between a statistic that is a point estimator and
one that is an interval estimator? When might you prefer an interval
estimator over a point estimator?
What is a confidence level with respect to a confidence interval?
What is a critical value and why is it important?
What happens to the margin of error for a confidence interval when the
sample size is increased? How is the margin of error related to the width
of the confidence interval? State this relationship in mathematical terms.
What happens to the width of the confidence interval if the confidence
level is increased from 95% to 99%? That is, does the width increase or
decrease? Why?
What happens to the width of the confidence interval if n, the size of the
sample, is increased? Why?
For additional participation credit, also comment within the thread of the
message posted in the Main Forum: Example: Using Statdisk to Find a
Confidence Interval
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