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Many teens have posted profiles on a social-networking website. A sample survey in 2007 asked a...

Many teens have posted profiles on a social-networking website. A sample survey in 2007 asked a random sample of teens with online profiles if they included false information in their profiles. Of 170 younger teens (aged 12 to 14), 117 said "yes." Of 317 older teens (aged 15 to 17), 159 said "yes."

1) Give a 95% large sample confidence interval for the difference between the proportions of younger and older teens who include false information in their online profiles. (Use

pyounger − polder.  Round your answers to four decimal places.)

Answer: ______to _______

Math   Statistics-And-Probability   
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Many teens have posted profiles on a social-networking website. A sample survey in 2007 asked a random sample of teens with online profiles if they included false information in their profiles. Of 170 younger teens (aged 12 to 14), 117 said "yes." Of 317 older teens (aged 15 to 17), 159 said "yes."

1) Give a 95% large sample confidence interval for the difference between the proportions of younger and older teens who include false information in their online profiles.

95% confidence inrterval

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