Question

A clever undergraduate, Grace N. Poise, hypothesizes that people under 30 are more humorous than people over 30. She tests this hypothesis by randomly selecting 4 people over 30 from the telephone book and 4 people under 30 from university registration lists. She gives each research participant the Humorous Speech Scale, which measures humor on a Likert-type scale from 1 to 10. The scores are listed below. People Under 30 People Over 30 6 5 7 6 10 2 9 3 Is this a one-tailed or a two-tailed test?

          A clever undergraduate, Grace N. Poise, hypothesizes that people under 30 are more humorous than people over 30. She tests this hypothesis by randomly selecting 4 people over 30 from the telephone book and 4 people under 30 from university registration lists. She gives each research participant the Humorous Speech Scale, which measures humor on a Likert-type scale from 1 to 10. The scores are listed below.
         People Under 30                              People Over 30
                     6                                                      5
                    7                                                       6
                   10                                                      2
                    9                                                       3
Is this a one-tailed or a two-tailed test?

Added by Vanessa D.

Question

Please give Ace some feedback