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8.60 why can you never really have 100% confidence of correctly estimating the population characteristics of interest?

8.61 when are you able to use the "t" distribution to develope confidence interval estimate by for the mean?

8.62 why is it true that for a given sample size, "n", an increase in confidence is achieved by widening (and making less precise) the confidence interval?

8.63 under what circumstance do you use a one-sided confidence interval instead of a two-sided confidence interval?

8.64 when would you want to estimate the population total instead of the population mean?

8.65 how does difference estimation differ from estimation of the mean?
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