(Steps Shown) The following data on seat belt usage and injury was collected in the 1970’s from selected states: Seat Belt Usage % of all Occupants Moderate
Question: The following data on seat belt usage and injury was collected in the 1970’s from selected states:
| Seat Belt Usage | % of all Occupants | Moderate injury | Serious or greater |
| Unbelted | 85.9 | 0.023 | 0.013 |
| Lap Belt | 3.9 | 0.011 | 0.009 |
| Lap and Shoulder Belt | 7.8 | 0.005 | 0.004 |
| Unknown | 2.4 |
- Regards the data as a random sample of 100,000 accident-related occupants over the whole decade from the whole country. Construct a confidence interval for the rate of moderate injury among those wearing lap-and-shoulder belts. Then do the same for those wearing no seat belts.
- Repeat (a) for injury that is serious or worse
- What can you conclude abut the value of the lap-and-shoulder belts?
Deliverable: Word Document 
Solution: Determine the regions where the following equation
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[Steps Shown] Given ∫_-∞ ^∞ e^-x^2dx=√π ,
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