#15

Two surfers and statistics students collected data on the number of days on which surfers surfed in the last month for 30 longboard (L) users and 30 shortboard (S) users. Treat these data as though they were from two independent random samples. Test the hypothesis that the mean days surfed for all longboarders is larger than the mean days surfed for all shortboarders (because longboards can go out in many different surfing conditions). Use a level of significance of 0.05. Longboard: 4, 10,8,4,7,8,9,6,7, 11, 13, 11, 10, 15, 12, 15, 13, 11, 12, 19, 19, 13, 12, 17,20,22,9,20,20,22 Shortboard: 6,4,4,6,9,9,6,9,4,8,8,5,8,9,4, 14, 12,9, 11, 12, 10, 15, 10, 12, 12, 16,9, 19,22, 10 Determine the hypotheses for this test. Choose the correct answer below. O A. HO: HL = Hs OB. HO- ML = Hs O C. HO: HL > Hs Ha: HL > Hs Ha- HL Hs Ha : HL = Hs OD. HO: ML HS OE. HO: ML HS OF. HO: ML = Hs Ha: HL = Hs Ha : HL = Hs Ha : HL * Hs Find the test statistic for this test. t=(Round to two decimal places as needed.) Find the p-value for this test. p-value =(Round to three decimal places as needed.) What is the conclusion for this test? O A. Do not reject Ho. The mean days surfed for longboarders is not significantly larger than the mean days surfed for all shortboarders O B. Do not reject Ho. The mean days surfed for longboarders is significantly larger than the mean days surfed for all shortboarders O C. Reject Ho. The mean days surfed for longboarders is not significantly larger than the mean days surfed for all shortboarders O D. Reject Ho- The mean days surfed for longboarders is significantly larger than the mean days surfed for all shortboarders\fQuestion 1/ of 26 This question: 5 point(s) possible Submit test The prices of a random sample of comparable (matched) textbooks from two schools were recorded. Assume that the population distribution of differences is approximately Normal, and assume that the sampling was random. Each book was priced separately; there were no K books "bundled" together. a. Compare the sample means b. Determine whether the mean prices of all books are significantly different. Use a significance level of 0.05. Click the icon to view the table of prices. a. Find the sample mean for University A. 5(Round to the nearest cent as needed.) Find the sample mean for University B. 6 (Round to the nearest cent as needed.) Compare the sample means. The sample mean is larger at b. Determine the hypotheses for this test. Let A be the population mean price for books at University A, and let up be the population mean price for books at University B. Use "difference = HA - Up- Choose the correct answer below. O A. Ho: "difference > 0 O B. Ho- Hdifference = 0 Ha: Hdifference = 0 Ha Hdifference # 0 O C. Ho: Hdifference = 0 O D. Ho: Hdifference 0 Ha Hdifference = 0 O E. Ho: Hdifference # 0 OF. Ho: Hdifference = 0 Ha: Hdifference = 0 Ha: Hdifference