The population mean short term memory score is 7 items. Dr….
The population mean short term memory score is 7 items. Dr. Estes measured mean short term memory for a group of 31 participants after a 15 minute power nap and recorded a mean of 7.35, and calculated a t-statistic of 2.18. Select the correct hypothesis test decision for a two-tailed t-test with alpha = .05.