Topic 1: Samples and point estimates
As it increases, the uncertainty (expressed as the standard error) of a point estimate decreases
What is the effect of sample size on the variance of a point estimate
It indicates how many standard deviations the point estimate is from the population mean or proportion
What does the test statistic (or Z-score) for a point estimate do?
Represents a “no difference” perspective; nothing special is happening
What is a suitable null hypothesis?
The mean or proportion of a sample that estimates the mean or proportion of the population it represents
What is the Point Estimate Definition
When would we use a t-test over a z test?
No difference is reported when there is actually one present
What is the definition of a Type 2 Error?
np >= 10 AND n(1-p)>=10
What is the success-failure condition?
Expresses the degree of confidence that the “real” population mean or proportion lies within a stated range of a point estimate
When a sample z-score exceeds the critical value
When would we reject the Null Hypothesis?
Sigma divided by the square root of n
What is the standard error (SE) of a point estimate for the mean?
point estimate +-Z* X SE
What is the formula for a confidence interval?
sample p-value is higher than alpha
When would we not reject the null hypothesis using the p-value method?