The principal of a school surveyed 200 students on the time they spent on the Internet after school . The mean and the standard deviation of the sample data are 2.4 hours and 0.8 hours , respectively . What is the margin of error for 95 % confidence interval ?

11%

Explanation:

Sample size, n = 200

Mean, m = 2.4

Standard deviation, s = 0.8

Z critical at 95% = 1.96

Margin of Error = Zcritical * sqrt(s^2 / n)

Margin of Error = 1.96 * sqrt(0.0032)

Margin of Error = 1.96 * 0.0565685

Margin of Error = 0.1108743

Hence, margin of error at 95% confidence interval is (0.1108743 * 100%) = 11.08% = 11%

federal power is further limited with a system of checks and balances that gives each branch of government a measure of power over the others.

explanation:

president franklin roosevelt supported the tva as part of his first new deal measures approved by congress in 1933. this new agency was designed to control floods, produce electric power, and improve the lives of people living in the tennessee valley. the tva accomplished many of these goals despite problems.