Basic Concepts of Research and Research Design: Types of Data, Validity, and Research Designs

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).