BER 345 - Homework #10 Covers Section 9.3 Plus: This will be a review of all some of our other hypothesis tests (all of chapters 8 and 9). It is a good review for the last exam. 1. Time magazine reported the result of a telephone poll of 800 adult Americans. The question posed of the Americans who were surveyed was: "Should the federal tax on cigarettes be raised to pay for health care reform?" The results of the survey were: Is there sufficient evidence at the = 0.05, to conclude that the two populations smokers and non-smokers differ significantly with respect to their opinions? 2. A standardized productivity scale has a = 25 and a = 5. The CEO of the company wants to know if employee participation in company decisions has an effect on productivity. A sample of n = 75 employees participated in the decision-making process was administered the productivity scale with a resulting mean of 27. Does participation in company decisions have an effect on productivity? Use = 0.01. 3. A sports psychologist read that lack of sleep impairs reaction time and wants to replicate the study. She collected data on two samples. Group 1 was kept awake for 24 hours. Group 2 was allowed to sleep comfortably for 8 hours. The following morning, both groups were given a test of reaction time with the following results shown below. Does sleep deprivation have an adverse effect on reaction time? Use = 0.05. Group 1: = 51 S1= 5.02 n1 = 14 Group 2: = 46 S2 = 6.43 n2 = 11 4. A dietician decides to study the \"no nighttime snack\" diet systematically to determine if such a diet has a significant effect on weight. She obtains a random sample of n=8 latenight snackers, weighs them, instructs them to elimate food from their diet after 9pm for 30 days, weighs them again, and analyzes the results to determine if there are any weight differences using an = 0.05. D = 8.63 SD = 9.2