Week 6 Question 12, 9.4.9-T Part 1 of 4 HW Score: 0%, 0 of 19 points O Points: 0 of 1 Save Researchers conducted an experiment to test the effects of alcohol. Errors were recorded in a test of visual and motor skills for a treatment group of 21 people who drank ethanol and another group of 21 people given a placebo. The errors for the treatment group have a standard deviation of 2. 10, and the errors for the placebo group have a standard deviation of 0.76. Assume that the two populations are normally distributed. Use a 0.05 significance level to test the claim that both groups have the same amount of variation among the errors. Let sample 1 be the sample with the larger sample variance, and let sample 2 be the sample with the smaller sample variance. What are the null and alternative hypotheses? OA. Ho: 02 7 03 OB. Ho: 64 - 65 H1 : 04 7 05 H1: 09 = 03 OD. HO : 07 OC. Ho: 02 =03 H1: 09 H2 OD. HO: H1 = H2 O C. Ho: H1 = H2 Clear all Check answer this Get more help -Week 6 Question 11, 9.4.3 HW Score: 0%, 0 of 19 points O Points: 0 of 1 Save A sample tested the claim that heights of men and heights of women have difference variances, with s = 7.48153 cm f women and 7.10802 cm for men. The sample sizes are n, = 142 and n2 = 153. When using the F test with these data, is it correct to reason that there is no need to check for normality because n, > 30 and n2 > 30? Choose the correct answer below. A. No. There is no need to check for normality regardless of the sample size. There is no normality requirement for the F test. OB. No. The F test has a requirement that samples be from normally distributed populations, regardless of how large the samples are. O C. No. There is no need to check for normality as long as n, 2 10 and n2 2 10. O D. Yes. The F test has a requirement that samples be from normally distributed populations, but this requirement can be ignored for large samples (n, and n2 greater than 30). Clear all Check answer more help -eek 6 Question 10, 9.3.12-T Part 1 of 6 HW Score: 0%, 0 of 19 points O Points: 0 of 1 Save A popular theory is that presidential candidates have an advantage if they are taller than their main opponents. Listed are heights (in centimeters) of randomly selected presidents along with the heights of their main opponents. Complete parts (a) and (b) below. Height (cm) of President 181 169 177 181 198 180 Height (cm) of Main Opponent 162 177 175 179 189 174 a. Use the sample data with a 0.05 significance level to test the claim that for the population of heights for presidents and their main opponents, the differences have a mean greater than 0 cm. In this example, uo is the mean value of the differences d for the population of all pairs of data, where each individual difference d is defined as the president's height minus their main opponent's height. What are the null and alternative hypotheses for the hypothesis test? Ho : Hd cm Hy : Hd cm (Type integers or decimals. Do not round.) Clear all Check answer Get more help -Week 6 Question 9, 9.3.2 HW Score: 0%, 0 of 19 points Part 1 of 3 O Points: 0 of 1 Save Listed below are body temperatures from five different subjects measured at 8 AM and again at 12 AM. Find the values of d and Sa. In general, what does Ha represent? Temperature (F) at 8 AM 98.2 98.7 97.4 97.5 97.3 Temperature (F) at 12 AM 99.0 99.4 97.6 97.3 97.4 Let the temperature at 8 AM be the first sample, and the temperature at 12 AM be the second sample. Find the values of d and Sd. d = (Type an integer or a decimal. Do not round.) Clear all Check answer Is Get more help -Stacy Amewoyi 10/30/22 11:39 AM (? Week 6 Question 8, 9.2.23-T HW Score: 0%, 0 of 19 points Part 1 of 4 Points: 0 of 1 Save Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Refer to the accompanying data set. Use a 0.01 significance level to test the claim that women and men have the same mean diastolic blood pressure. Click the icon to view the data for diastolic blood pressure for men and women. Let u, be the mean diastolic blood pressure for women and let u2 be the mean diastolic blood pressure for men. What are the null and alternative hypotheses? OB. Ho: H1 F H2 OA. Ho: Hy

H2 Check answer Clear all