1.Which of the following describes a correct effect on which the width of a confidence interval?

I.As sample size increases, the width of the confidence interval decreases.

II.As the confidence level increases, the width of the confidence interval increases.

III.As the margin of error for the estimates increases, the width of the confidence interval increases.

II only

I only

I and II

I,II,and III

2.The article "High-Dose NicotinePatch Therapy" includes this statement:"Of the 71 subjects, 70% were abstinent from smoking at 8 weeks (95% confidence interval [CI], 58% to 81%."Use that statement to find the point estimateand the margin of error E

=0.695,E =0.115

=0.58,E =0.23

=0.58,E =0.115

=0.695,E =0.23