Answer Happy

Two groups of participants were asked to solve anagrams in three
blocks of 30 minutes. One group received 2mg of nicotine prior to
each block, the other received a placebo. The number of anagrams
correctly solved is
34.00 34.00 30.00 Nicotine
26.00 31.00 18.00 Nicotine
18.00 19.00 12.00 Nicotine
31.00 33.00 28.00 Nicotine
26.00 23.00 21.00 Nicotine
33.00 26.00 17.00 Nicotine
31.00 29.00 19.00 Nicotine
21.00 16.00 13.00 Nicotine
34.00 35.00 26.00 Nicotine
28.00 23.00 14.00 Nicotine
37.00 32.00 24.00 Nicotine
26.00 31.00 35.00 Placebo
36.00 27.00 30.00 Placebo
27.00 36.00 31.00 Placebo
27.00 31.00 36.00 Placebo
32.00 28.00 19.00 Placebo
29.00 34.00 19.00 Placebo
35.00 29.00 32.00 Placebo
36.00 29.00 34.00 Placebo
32.00 35.00 28.00 Placebo
28.00 36.00 23.00 Placebo
28.00 30.00 32.00 Placebo
29.00 36.00 31.00 Placebo
Discuss any potential threats to validity, whether you think that
assumptions have been violated, and what one might have to do if
they have