As part of a study designed to test the safety of automobiles, the National Transportation Safety Board collected and reviewed data about the effects of an automobile crash on test dummies. Cars with dummies in the front seats were crashed into a wall at a speed of 35 miles per hour. We want to know the proportion of dummies in the driver’s seat that would have had head injuries if they had been actual drivers. Head injury data for the dummies in the driver’s seat are listed on the spreadsheet. Use a 0.05 significance level. Find the P-value to test the null hypothesis that the different weight categories have the same mean. Do the sample data suggest that larger cars are safer? Subcompact Compact Midsize Fullsize

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.