SOLUTION: Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car. They randomly survey 403 drivers and find that 284 cla
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Question 1119719: Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car. They randomly survey 403 drivers and find that 284 claim to always buckle up. Construct a Invalid variable% confidence interval for the population proportion that claim to always buckle up.
Enter your answer using interval notation. Example: [2.1,5.6172) Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! proportion point estimate is 284/403=0.7047=p hat
interval for 95% CI uses 1.96*sqrt(ph*(1-ph)/n)
this interval is 0.0445
CI is 0.7047 +/- 0.0445
(0.6602, 0.7492)
