You must show your work to get full marks! 1. A March 2018 Gallup survey asked a sample of 1,041 adults if they wanted stricter laws covering the sale of firearms. A total of 687 of the survey respondents said "yes".

(a) What important information is missing from the question? Check the conditions for using the normal model.

(b) What is the sample proportion?

(c) What is the standard error?

(d) Construct a 95% C.I. for the true proportion of adults who want stricter laws covering the sale of firearms.

(e) How large of a sample would you need your margin of error down to half of the size in part(d)?