Question

in the youth risk behavior survey, 677 out of 1356 12th grade males said they always wear a seatbelts. construct a 95% confidence interval for the true population of a 12th grade males that wear a seat belt.

Answer 1

For 95% CI z = 1.96

CI = (0.4727, 0.5259)

Hence, true proportion of a 12th grade males that wear a seat belt is between 0.4727 an 0.5259.

This is rounded to 4 decimal places.

I hope this will help. Thank you.