This week we will begin the inference part of the course, which is making an estimate or testing a claim about a population based on only a sample. The first  video gives an introduction to estimation and an overall summary of the confidence interval. We will cover this in more detail in class this week. The second video goes through an example of how to calculate and interpret a confidence interval for battery life Go ahead and watch these videos and make comments about what they are trying to convey about estimation using confidence intervals.