Safety. Observers in Texas watched children at playin eight communities. Of the 814 children seen biking,roller skating, or skateboarding, only 14% wore a helmet.a) Create and interpret a 95% confidence interval.b) What concerns do you have about this study thatmight make your confidence interval unreliable? c) Suppose we want to do this study again, picking vari-ous communities and locations at random, and hope to end up with a 98% confidence interval having amargin of error of {4,. How many children mustwe observe?

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Safety. Observers in Texas watched children at play
in eight communities. Of the 814 children seen biking,
roller skating, or skateboarding, only 14% wore a helmet.
a) Create and interpret a 95% confidence interval.
b) What concerns do you have about this study that
might make your confidence interval unreliable?
c) Suppose we want to do this study again, picking vari-
ous communities and locations at random, and hope
to end up with a 98% confidence interval having a
margin of error of {4,. How many children must
we observe?
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