. Explain why it is impossible to measure an object.

2. What is the difference between a conceptual definition and an operational definition.

3. Describe the four types of scales.

4. How is the interval scale more sophisticated than the nominal and ordinal scales?

5. "Whenever possible, it is advisable to use instruments that have already been developed and repeatedly used in published studies rather than develop our own instruments for our studies". Do you agree? Discuss the reasons for your answer.