Question: When people learn a new task, their performance usually improves when they are tested the next day, but only if they get at least 6

  1. When people learn a new task, their performance usually improves when they are tested the next day, but only if they get at least 6 hours of sleep (Stickgold, Whidbee, Schirmer, Patel, & Hobson, 2000). The following data demonstrate this phenomenon. The participants learned a visual discrimination task on one day, and then were tested on the task the following day. Is there a significant difference between the two conditions?

PERFORMANCE SCORE

6HOURS OF SLEEP

n=13

M= 72

SS= 932

NO SLEEP

n= 14

M=65

SS=706

  1. Use the steps of a two-tailed hypothesis test with = .05.(8 pts.)
  2. Figure the effect size.(2 pts.)

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