ssume that, on average, healthy young adults dream 90 minutes each night, as d from a number of measures, including rapid eye movement (REM) sleep. An gator wishes to determine whether drinking coffee just before going to sleep affects aunt of dream time. After drinking a standard amount of coffee, dream time is red for each of 28 healthy young adults in a random sample. Results show a sample '61, of 88 minutes and a sample standard deviation, s, of 9 minutes. t to test the null hypothesis at the .05 level of significance e the following information: n = 28 healthy young adults 5t: 88 minutes 5 = 9 minutes df =281= 27 Jothesis are: HYPOTHESIS ALTERNATIVE HYPOTHESIS =90 H u: p