- An experiment examined the impact of THC (the active ingredientin marijuana) on various physiological and psychological variables.The study recruited a sample of 18 young adults who were habitualmarijuana smokers. Subjects came to the lab 3 times, each timesmoking a different marijuana cigarette: one with 3.9% THC, onewith 1.8% THC, and one with no THC (a placebo). The order of theconditions was randomized in a double-blind design.
At the start of each session, nosubject reported being “high.” After smoking the cigarette,participants rated how “high” they felt, using a positivecontinuous scale (0 representing not at all “high”). For theplacebo condition, participants reported a mean “high” feeling of11.3, with a standard deviation of 15.5. Is there evidence of asignificant placebo effect, with subject feeling significantly“high” after smoking a placebo marijuana cigarette?
the appropriate null and alternativehypotheses for this study- H0: m = 0versus Ha: m > 0
a. What is the appropriate statisticto test this hypothesis? What is its value?
b. what is the P-value forthe appropriate test? Specify the distribution used and allrelevant parameters.
