WST03 · Module
Estimation, confidence intervals and tests
Tests for a population mean
Has the average changed? Assume it hasn't, work out how many standard errors the sample mean is from the claimed mean, and compare that with the critical value for your significance level.
≈ 40 minConfidence intervals
A single estimate is almost certainly a little wrong. A confidence interval gives a range, , built so that in, say, of samples the range would capture the true mean.
≈ 40 min