Having trouble understanding how to find the lower and upper bound for both problems. Please do both if possible. Thank You SO MUCH!!! Stay Safe!
Score: 0 of 1 pt 5 of 7 (6 complete) HW Score: 62.3%, 4.36 of 7 pt 11.2.13 Question Help The manufacturer of hardness testing equipment uses steel-ball indenters to penetrate metal that is being tested. However, the manufacturer thinks it would be better to use a diamond indenter so that all types of metal can be tested. Because of differences between the two types of indenters, it is suspected that the two methods will produce different hardness readings. The metal specimens to be tested are large enough so that two indentions can be made. Therefore, the manufacturer uses both indenters on each specimen and compares the hardness readings. Construct a 95% confidence interval to judge whether the two indenters result in different measurements. Note: A normal probability plot and boxplot of the data indicate that the differences are approximately normally distributed with no outliers. Click the icon to view the data table. Construct a 95% confidence interval to judge whether the two indenters result in different measurements, where the differences are computed as 'diamond minus steel ball'. The lower bound is The upper bound is. (Round to the nearest tenth as needed.) i Data Table - X Specimen 1 2 3 4 5 6 7 8 9 Steel ball 51 57 61 70 68 54 65 51 53 Diamond 53 56 74 69 56 68 51 56 Print DoneScore: 0.25 of 1 pt 6 of 7 (6 complete) HW Score: 62.3%, 4.36 of 7 pts yX 11.2.15 Question Help To illustrate the effects of driving under the influence (DUI) of alcohol, a police officer brought a DUI simulator to a local high school. Student reaction time in an emergency was measured with unimpaired vision and also while wearing a pair of special goggles to simulate the effects of alcohol on vision. For a random sample of nine teenagers, the time (in seconds) required to bring the vehicle to a stop from a speed of 60 miles per hour was recorded. Complete parts (a) and (b). Note: A normal probability plot and boxplot of the data indicate that the differences are approximately normally distributed with no outliers. Click the icon to view the data table. (a) Whether the student had unimpaired vision or wore goggles first was randomly selected. Why is this a good idea in designing the experiment? O A. This is a good idea in designing the experiment because reaction times are different. O B. This is a good idea in designing the experiment because the sample size is not large enough. C. This is a good idea in designing the experiment because it controls for any "learning" that may occur in using the simulator. (b) Use a 95% confidence interval to test if there is a difference in braking time with impaired vision and normal vision where the differences are computed as "impaired minus normal." The lower bound is X The upper bound is Data Table (Round to the nearest thousandth as needed.) Subject 1 2 3 4 5 6 7 8 9 Normal, Xi 4.47 4.24 4.58 4.65 4.31 4.80 4.55 5.00 4.79 Impaired, Y, 5.77 5.85 5.45 5.32 5.90 5.49 5.23 5.61 5.63 Enter your answer in the edit fields and then click Check Ar Print Done
