Part b and d are still wrong. Part B (Round the calculation for Welch's df to the nearest integer. Round your final answers to 3 decimal places. Negative values should be indicated by a minus sign.) pass the decimal point

Safari File Edit View History Bookmarks Window Help 18 96% [27. Thu May 21 10:57 PM Q E ... G E newconnect.mheducation.com C mask facemask filte. Walmart.com | Save.. eCampus: Home Books & Tools MHE Reader Connect - Class: D... Wk 4 - Practice: W. Course Hero Homework Market Papa Track + Wk 4 - Practice: Wk 4 Exercises [due Sat] i Saved Help Save & Exit Submit Check my work mode : This shows what is correct or incorrect for the work you have completed so far. It does not indicate completion. Return to question 7 A special bumper was installed on selected vehicles in a large fleet. The dollar cost of body repairs was recorded for all vehicles that were involved in accidents over a 1-year period. Those with the special bumper are the test group and the other vehicles are the control group, shown below. Each "repair incident" is defined as an invoice (which might include more than one separate type of 2 damage). points Statistic Test Group Control Group Mean Damage X1 = $ 1, 249 X2 = $ 1, 790 Sample Std. Dev. $1 = $ 677 52 = $ 809 Repair Incidents m1 = 15 n2 = 12 Source: Unpublished study by Thomas W. Lauer and Floyd G. Willoughby. (a) Construct a 90 percent confidence interval for the true difference of the means assuming equal variances. (Round your final answers to 3 decimal places. Negative values should be indicated by a minus sign.) The 90% confidence interval is from -1029.228 to -52.772 (b) Repeat part (a), using the assumption of unequal variances with Welch's formula for d.f. (Round the calculation for Welch's df to the nearest integer. Round your final answers to 3 decimal places. Negative values should be indicated by a minus sign.) The 90% confidence interval is from -1040.76 @ to -41.24 (c) Did the assumption about variances change the conclusion? Yes Graw Education 4 tv X O MAY W 21Safari File Edit View History Bookmarks Window Help 18 96% [27 Thu May 21 10:58 PM Q E ... G E newconnect.mheducation.com C mask facemask filte. Walmart.com | Save.. eCampus: Home Books & Tools MHE Reader Connect - Class: D... Wk 4 - Practice: W.. Course Hero Homework Market Papa Track + Wk 4 - Practice: Wk 4 Exercises [due Sat] i Saved Help Save & Exit Submit Check my work mode : This shows what is correct or incorrect for the work you have completed so far. It does not indicate completion. Return to question 7 allSVCIS L 3 UCLIIIIal PIGLES. IEyaLIVE values DI lulu UE IIIUILalcu wy a Hillliu> >lyII.) The 90% confidence interval is from -1029.228 @ to -52.772 2 (b) Repeat part (a), using the assumption of unequal variances with Welch's formula for d.f. (Round the calculation for Welch's df to the points nearest integer. Round your final answers to 3 decimal places. Negative values should be indicated by a minus sign.) The 90% confidence interval is from -1040.76 @ to -41.24 (c) Did the assumption about variances change the conclusion? O Yes No (d) Construct separate 90% confidence intervals for each mean. (Round your intermediate tcrit value to 3 decimal places. Round your final answers to 2 decimal places.) Mean Damage Confidence Interval X1 = $1,249 1709 x , $ 1302 2 ) X2 = $1,790 ($ 1109 $ 1014 Graw Education O! MAY W X O 21