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

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)
RELATED QUESTIONS
Marketing companies are interested in knowing the population percent of women who make... (answered by Theo)

Insurance companies are becoming concerned that the increased use of cell phones is... (answered by Boreal)

A car insurance company has determined that 6% of all drivers were involved in a car... (answered by )

A car insurance company has determined that 9% of all drivers were involved in a car... (answered by Theo)

The following information was obtained from a survey of insurance companies about the... (answered by Theo,ikleyn)

A psychologist is interested in knowing whether adults who were bullied as children... (answered by rothauserc)

A psychologist is interested in knowing whether adults who were bullied as children... (answered by stanbon)

The fraction of students that are interested in a new brand of sneakers is twice the... (answered by stanbon)

An insurance company is interested in knowing the occupation and gender of the residents... (answered by ikleyn)