4.7 - Summary

So now, Ellie can work from her sample statistics (the mean and standard deviation from her sample) to an estimate of the true population parameter using a confidence interval. In doing so, she leveraged the information about the size of the sample, utilized good sampling techniques, and employed some useful descriptive statistics about her sample. Ellie can now make a confident guess as to how much running the marathoners put in to train for the big event!