Confidence Intervals Flashcards
1
Q
What is standard error?
A
Measure of how precisely population mean is measured by the sample mean
2
Q
Formula for standard error
A
SE = SD/✔️n
SD=standard deviation
n = number of observations
3
Q
Effect of sample size (n) on standard error
A
Larger sample size leads to smaller standard error
4
Q
Formula for 95% confidence interval
A
95% CI = sample mean -+ 1.96*SE
5
Q
Z value for 90% CI
A
1.65
6
Q
Z value for 99% CI
A
2.58
7
Q
If CI does not contain 0
A
Results statistically significant
8
Q
If CI contains 0
A
Results not statistically significant but not evidence of no change
9
Q
What is 95% confidence interval?
A
Interval of values in which there is a 95% probability of the population mean lying
