An experiment examined the impact of THC (the active ingredient in marijuana) on various physiological and...

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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 â€œhigh.â€ After smoking the cigarette,participants rated how â€œhighâ€ they felt, using a positivecontinuous scale (0 representing not at all â€œhighâ€). For theplacebo condition, participants reported a mean â€œhighâ€ feeling of11.3, with a standard deviation of 15.5. Is there evidence of asignificant placebo effect, with subject feeling significantlyâ€œhighâ€ after smoking a placebo marijuana cigarette?
the appropriate null and alternativehypotheses for this study- H₀: m = 0versus H_a: 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.

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3.9 Ratings (457 Votes)

Given that population meanu0 sample mean x 113 standard deviation s 155 number n18 null Ho 0 alternate H1 0 level of significance 005 from standard normal tableright tailed t 2 See Answer

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