on 1 During the recent century, some regions have become heavily industrial. The industries that operate there emit pollution that can change the level of acidity (measured as PH level) of rainwater that falls in the region. Scientists have long suspected that industrial pollution leads to more acidic rain (rain with lower PH level). Scientists know that before the industrial development of the region, the rainwater falling in that region had an average pH level of d out of 6.3, with standard deviation 0.45. Recently, a study of rainwater collected in the region involved 39 samples of rainwater. The scientists observed a sample mean pH of 6.1. The research question here is: Can scientists conclude that the average pH level for rain in this region is lower now than it was before question heavy industry arrived? Reference: Ref 14-4 Based on the research question, the correct null and alternative hypotheses would be Select one: O a. Ho: W = 6.3 and Ha: H 6.3. O c. Ho: H = 6.3 and Ha H $ 6.3. O d. Ho: H = 6.3 and Ha: H = 6.3. Clear my choice Question 2 A psychologist administers a test of reflex times to men and women. In the study, the reaction speed to an electrical shock stimulus was measured for a Not yet sample of men and for a sample of women. The researcher thinks there may be a difference between men and women in this response. Let answered Marked out of HM 1.0 P Flag question be the average reaction speed for all men. Let HW be the average reaction time for all women. The researcher formulates the hypotheses Ho: HM HW and Ha: HM HW Which of the following is a true statement of this situation and proposal? Select one: O a. The researcher should use a two-sided alternative hypotheses, because this alternative hypothesis implies a known direction of the difference that was not obvious to start with. O b. The researcher needs to be sure that both samples are of the same size (equal counts of men and women) O c. The researcher should now compute a Pvalue and reach a conclusion. O d. The null hypothesis should indicate a difference. Clear my choice Question 5 Not yet Suppose in a test of hypotheses, data are deemed to be significant at level a = 0.08, but not significant at level a = 0.04. Which of the following is true answered about the Pvalue, P, associated with this test? Marked out of 1.0 Select one: P Flag question O a. P> 0.08 O b. P