Question: Protecting teens Th e previous exercise describes a sample survey of 1070 teens, with margin of error 63% for 95% confi dence. (a) An agency

Protecting teens Th e previous exercise describes a sample survey of 1070 teens, with margin of error 63% for 95% confi dence.

(a) An agency that is responsible for protecting children thinks that 95% confi -

dence is not enough. Th ey want to be 99% confi dent. How would the margin of error for 99% confi dence based on the same sample compare with the margin of error for 95% confi dence?

(b) A parents group is satisfi ed with 95% confi dence but wants a smaller margin of error than 63%. How can we get a smaller margin of error, still with 95% confi dence?

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