Chapter 11 Flashcards
1
Q
what do confidence intervals estimate?
A
Estimating the true difference
between the means of the populations.
2
Q
what does the width of a confidence interval depend on
A
sample size (larger samples yield narrower intervals and variability in the data. More variability leads to wider intervals or less certainty/precision.
3
Q
what test do you use when you know the SD and are comparing a sample mean to u ?
A
z test
4
Q
what test do you use when you dont know the SD and are comparing a sample mean to u ?
A
one sample t test
5
Q
what test do you use when comparing two sample means that have the same people tested twice?
A
paired (related t test)
6
Q
Then you are comparing two sample means, and there are 2 different groups?
A
independent sample t test
