The first thing we will look at in this course is sample moments. We begin with fundamental concepts such as population, sample and random sample. We then look at moments from a single variable: sample mean, sample variance and sample standard deviation. We then look at sample moments from two variables: sample covariance and sample correlation. This section is heavily dependent on sums. To review sums, check out the final section of Equations and sums. You will practice working with sums mathematically as well as in Excel.