A study of seat belt use involved children who were hospitalized after motor vehicle crashes. 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. For a group of 290 children who were not wearing seat belts, the number of days spent in ICUs has a mean of 1.39 and a standard deviation of 3.06 (based on data from “Morbidity Among Pediatric Mo-tor Vehicle Crash Victims: The Effectiveness of Seat Belts,” by Osberg and Di Scala, American Journal of Public Health, Vol. 82, No. 3). 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 Construct a confidence interval estimate of the difference between the mean number of days in an ICI of the two groups of children. What confidence level would be appropriate? (See page 387). Find the margin of error E using the formula on page 460. What is it? What is the confidence interval? Explain the meaning of this confidence interval and what the limits represent.
A study of seat belt use involved children who were hospitalized after motor vehicle crashes. For a group of 123 children who were wearing seat belts, the number of days in intensive care units (ICU) has a
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
Construct a confidence
- What confidence level would be appropriate? (See page 387).
- Find the margin of error E using the formula on page 460. What is it?
- What is the confidence interval? Explain the meaning of this confidence interval and what the limits represent.
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