1. Critique the statement that "the average human attention span is 8 seconds." 2. Mr. McCall quotes Drs. Dukette and Cornish as stating "Continuous attention span may be as short as 8 seconds. After this amount of time, it's likely an individual's eyes may shift, or a stray thought will briefly enter consciousness. However, these short lapses are only minimally distracting and do not tend to interfere with task performance. Attention spans in children may be 3 to 5 minutes increasing as we age to adults being about 20 minutes. Adults can reset their attention spans at 20-minute intervals, if they so desire." How does this square with the Microsoft conclusion? What is one takeaway from this?

3. What is a hypothesis?

4. Explain the relationship between the null and alternative hypotheses.

5. Explain what is meant by "proof by contradiction."

6. What is the role of alpha in significance testing?

7. Why is it important to also consider effect size when making conclusions about significance of results?

8. The Microsoft study divided participants into three groups based on attentional criteria. What sampling method does this represent? Why was that appropriate? (or, why not?)