So we're looking at people wearing seatbelts and not wearing seatbelts Children and finding out how many days they stay in the I. What important conclusion do the results suggest? Construct a confidence interval appropriate for the hypothesis test in part (a).Ĭ. Use a 0.05 significance level to test the claim that children wearing seat belts have a lower mean length of time in an ICU than the mean for children not wearing seat belts.ī.
Of 1.39 and a standard deviation of 3.06 (based on data from "Morbidity Among Pediatric Motor Vehicle Crash Victims: The Effectiveness of Seat Belts," by Osberg and Di Scala, American Joumal of Public Health, Vol. Of 290 children who were not wearing seat belts, the number of days spent in ICUs has a mean For a group of 123 children who were wearing seat belts, the number of days in intensive care units (ICU) has a mean of 0.83 and a standard deviation of 1.77. Seat Belts A study of seat belt use involved children who were hospitalized after motor vehicle crashes. (Note: Answers in Appendix D include technology answers based on Formula 9 - 1 along with "Table" answers based on Table $A$ - 3 with df equal to the smaller of $\boldsymbol. There is sufficient evidence to indicate that differences exist among the mean carat weights for the three certification groups There is sufficient evidence to indicate that the mean carat weight for the GIA group is lower than the other tWO groupsĪssume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Give a practical conclusion for the test in the words of the problem: Use a = 0.10 to make your conclusion There is insufficient evidence to indicate that differences exist among the mean carat weights for the three certification groups There is sufficient evidence to indicate that the mean carat weight for the HRD group equals the mean carat weight for the IGl group. A study was conducted t0 determine if the average size of diamonds reported by these three certification groups differ: A completely randomized design was used and the resulting ANOVA table is shown below: 307 diamonds were sampled and randomly sorted into three groups of diamonds These diamonds were randomly assigned to one of the three organizations or groups (HRD, GIA, or IGI) that certify the appraisal of diamonds.
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