1.The EPA claims that fluoride in children’s drinking water should be at a mean level of less than 1.2 ppm, or parts per million, to reduce the number of dental cavities. Identify the Type I error. (Points : 1) 2.Biologists are investigating if their efforts to prevent erosion on the bank of a stream have been statistically significant. For this stream, a narrow channel width is a good indicator that erosion is not occurring. Test the claim that the mean width of ten locations within the stream is greater than 3.7 meters. Assume that a simple random sample has been taken, the population standard deviation is not known, and the population is normally distributed. Use the following sample data: 3.3 3.3 3.5 4.9 3.5 4.1 4.1 5 7.3 6.2 What is the P-value associated with your test statistic? Report your answer with three decimals, e.g., .987 . (Points : 1) 3.Scientists, researching large woody debris (LWD), surveyed the number of LWD pieces from aerial photos taken annually for the past 35 years at two different sites. Over the 35 years of photos examined, the first site had a mean number of LWD pieces per hectare per year (LWD/ha/yr) of 3.7 pieces with a standard deviation of 1.9. The second site had a mean number of LWD/ha/yr of 4.3 with a standard deviation of 2.4. Assume a .05 significance level for testing the claim that the mean LWD/ha at the first site had less than the mean LWD/ha/yr at the second site. Also, assume the two samples are independent simple random samples selected from normally distributed populations, but do not assume that the population standard deviations are equal. Find the t test statistic. Give your answer with two decimals, e.g., 9.87 (Points : 1) 4.Given: There is a significant linear correlation between cordgrass monitored for survival on the left bank of a creek and cordgrass monitored for survival on the right bank of a creek. Identify the choice below that contains a conclusion with a common correlation error. (Points : 1) Conclusion: r results in a value close to 1 Conclusion: an increase in cordgrass survival on the left bank is related to an increase in cordgrass survival on the right bank Conclusion: an decrease in cordgrass survival on the left bank causes a decrease in cordgrass survival on the right bank Conclusion: r results in a value close to -1 5.Use a .05 significance level and the observed frequencies of 70 Neonatal deaths to test the claim that number of neonatal deaths on each day of the week is equally likely. Mon Tues Wed Thurs Fri Sat Sun 10 9 5 8 15 12 11 Determine the value of the Ï‡2 test statistic. Give your answer to two decimals, e.g., 12.34 . (Points : 1) 6.Using a .01 significance level, test the claim that the proportions of people who favor/oppose pro-choice on the abortion issue are the same for the males and females. Gender Male Female Favor Pro-Choice 65 120 Oppose Pro-Choice 42 38 Do you reject the null hypothesis, at the .01 significance level? Enter Y for yes (reject), N for no (fail to reject). (Points : 1) 7.The table represents results from an experiment with patients afflicted with eczema on both arms. Each patient was treated with an immune modulator cream on one arm and a topical steroid cream on the other arm. Using a .05 significance level, apply McNemar’s test to test the following claim: The proportion of patients with no cure on the immune modulator treated arm and a cure on the topical steroid treated arm is the same as the proportion of patients with a cure on the immune modulator treated arm and no cure on the topical steroid treated arm. Immune Modulator Cream Cure No Cure Topical Steroid Cure 25 11 Cream No Cure 42 22 Determine the value of the Ï‡2 test statistic. Give your answer to two decimals, e.g., 12.34 (Points : 1) 8.Geneticists studying carriers of genetic diseases followed subjects subdivided by race. Researchers randomly selected sev
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