The types of measurement, design and validity are very important concepts. When formulating and completing experimentation, taking certain factors into consideration is very important. When designing experimentation on a topic of interest, it will be important to align the proper tools to the topic. To help prepare for this, submit a post with the following points:

• Summarize the purpose and differences between the four statistical scales of measurement.
• Compare and contrast the four major research designs.
• List the different types of validity and explain their importance (make sure to interact with other student comments on this point).