Unit 8

Question 1

Confidence Interval in context

Answer 1

I am C% confident that the [true parameter] is between ___ and ____.

Use context for [true parameter]

Question 2

Confidence Interval conditions

Answer 2

Stay the same!

Independence: N>10n
Normal: n>30
Randomness: stated

*If you aren’t given a confidence interval- pick your own! (95% is a good one)

_____ ≤ mew ≤ ______

Question 3

When should you use t-distributions?

Answer 3

When sample (n) is less than 30

t-distributions are ALWAYS mean

Question 4

T-distribution Conditions

Answer 4

Independence: N ≥ 10n
Normality: Delete outliers, then use judgement (normal quantile plot, if possible, graph #6 in StatPlot, linear = normal)
Random: Usually stated