# Yesterday

We learned about measures of spread (sorry I forgot to post this!). The big one is Standard Deviation, which is represented by the greek letter $\sigma$ for a population and $s$ for a sample. There is a formula, but it’s long and not really important here. It’s in your textbook.

We worked on the Chromebooks to find the mean and standard deviation for a given data set.

Here’s a video that explains why we have standard deviation and how it works:

# Today

We talked a bunch about sampling and how to make good questions. We didn’t finish our questions chat, so that’ll be what we do on Monday morning. Here’s the promised page about sampling and sample types:

sampling

Have a great weekend!