A psychologist studying human memory would like to examine the process of forgetting.One group of subjects is required to memorize a list of words in the evening just before going to bed.Their recall is tested 10 hours later in the morning.Subjects in the second group memorize the same list of words in the morning, and then their memories are tested 10 hours later after being awake all day.The psychologist hypothesizes that there will be less forgetting during sleep than during a busy day.The recall scores for two samples of college students are as follows:

ASLEEP SCORES: 15 13 14 14 16 15 16 15 16 15 17 14

AWAKE SCORES 15 13 14 1214 13 11 12 13 13 12 14

M = 15M = 13 s = 1.13s = 1.13

a. Sketch a frequency distribution polygon for the "asleep" group.On the same graph (in a different color) sketch the distribution for the "awake" group.Just by looking at these two distributions, would you predict a significant difference between the two treatment conditions?

b. Calculate the independent measures t statistic to determine whether there is a significant difference between the groups. Use .05 level of significance. What do the findings show?