We were finishing Page 148 #1-7, 9-14 today. Be careful with interpreting the charts in numbers 7 and 9. You need to have these questions all done before tomorrow’s class.

You should now be able to calculate, for populations and for samples, the following:

- mean
- median
- mode
- quartiles
- percentiles
- interquartile range
- semi-interquartile range
- standard deviation
- variance
- z-scores

You should also be able to create box-and-whisker plots.

For small data sets you need to be able to do all this by hand (i.e. using paper and a calculator). For larger data sets you need to be able to use a spreadsheet or other software (we’ll practice this some more yet).

Most importantly, you need to use this information to interpret data sets. For example, you should be able to find outliers or explain what the standard deviation for a particular data set *means* about that data.

Advertisements

The supply teacher didn’t show up. We watched 40 mins of Spongebob through the Elmo pointed at my iPod before everyone left.