Chapter 10: Estimating Means with Confidence

Question 1

When should we use a t* critical value rather than a z* critical value for calculating a CI for a population mean?

Answer 1

when we use s to estimate an unknown (sigma standard deviation)

Question 2

finding t*

Answer 2

invt ((1/CI)/2, n-1)

Question 3

Paired Data

Answer 3

result from recording two values of the same quantitative variable for each individual or for each pair of similar individuals

Question 4

Analyzing Paired Data

Answer 4

to analyze paired data, start by computing the difference for each pair. Use the mean difference (Xdiff bar) and the standard deviation of the differences (Sdiff) as summary statistics. Analyze as using 1-sample procedures.

Question 5

Convincing Evidence?

Answer 5

if the interval contains 0, there is no convincing evidence.