Question 8 3 pts A pharmaceutical company is examining the relationship between the dosage of a new cold medication and the number of days before all cold symptoms disappear. Various dosages ranging from 200 to 1,200 milligrams (mg) in 100-milligram increments were given to 76 randomly selected patients. A check of the conditions necessary for inference for the slope of a regression line shows that they are met. A 95% condence interval for the slope of the regression line relating the dosage, x, to the weight loss, y, is given by (-2.13, -1.04). Based on the condence interval, which of the following claims is supported? 0 There is not a linear relationship between the dosage and the number of days until all symptoms disappear. O A 100 mg increase in dosage results in an increase in the time until all symptoms disappear by more than one day on average. 0 A 100 mg increase in dosage results in a decrease in the time until all symptoms disappear by more than one day on average. 0 A 100 mg increase in dosage results in a decrease in the time until all symptoms disappear by more than two days on average. Question 9 3 pts A sociologist recorded the number of Twitter followers and the number of weekly Twitter posts for 20 active Twitter users. The resulting data were used to conduct a hypothesis test to investigate whether there is a linear relationship between the number of followers and the number of Twitter posts. What are the correct hypotheses for the test? Hazl0 Question 9 3 pts A sociologist recorded the number of Twitter followers and the number of weekly Twitter posts for 20 active Twitter users. The resulting data were used to conduct a hypothesis test to investigate whether there is a linear relationship between the number of followers and the number of Twitter posts. What are the correct hypotheses for the test? 0 H0351=0 Ha:310 Question 10 3 pts Depth-specic groundwater samples from an experimental borehole at intervals of 6 in between 28 and 58 in. were taken and the percent of iron each sample was calculated. A regression analysis produced the equation: predicted % iron = 3.078+0.0117(depth). A hypothesis test was conducted to investigate whether there is a linear relationship between the % of iron in the sample and the depth (inches). The standard error for the slope of the regression line is SEb=0.0027 Assuming the conditions for inference have been met, which of the following is closest to the value of the test statistic for the hypothesis test? 0 t=0.000025 O t=4.33 O t=3.078 o t=1.96