• Exploratory Data Analysis
• Comparing Groups
- As mentioned in previous units, it is important for
students to first pose a research question before collecting and
examining data. In this case, students may not already have data to
work with, but having a big picture question in mind will help them to
more effectively design a study and collect the appropriate data.
- In this unit, students will learn how to design studies to
determine the effect of a treatment variable on a response variable.
Thus they must think of which treatment groups they need to compare and
how to control for other factors to isolate the effect of the treatment.
- One can analyze any data set and compare it to other data
sets or compare observations within that data set. However, if one
hopes to use a data set from a sample or samples to make inferences
about the underlying population or populations, one must carefully
design the collection of data.
- We will return to this topic of data collection at the end
of the course when students more experience measuring statistical
differences between groups.