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18. A team of researchers studied the effects of sleep deprivation on decay of short-term memory. Eight participants stayed in a lab for 2 days. Four were randomly assigned not to sleep during that period. The other four were allowed to sleep when they wanted to do so. At the end of the 2 days, the participants completed a short-term memory task. Here are the results: Mean Time (Seconds) for Remembering Sleep Deprived Normal Sleep 11 J Based on these results, does sleep deprivation reduce short-term memory? (Use the .05 significance level. a) Use (and clearly label) the five steps of hypothesis testing. (20 pts.) b) Calculate the effect size. (3 pts.)