Answer Happy

An SRS of 450 high school seniors gained an average of x = 44 points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation o = 28. What is the margin of error for a confidence level of 90%? Give your answer to three decimal places. margin of error: How does decreasing the confidence level change the margin of error of a confidence interval when the sample size and population standard deviation remain the same? Decreasing the confidence level keeps the margin of error the same, provided the sample size and population standard deviation remain the same. Decreasing the confidence level decreases the margin of error, provided the sample size and population standard deviation remain the same. Decreasing the confidence level decreases the margin of error, provided the sample size and population standard deviation also decrease. O Decreasing the confidence level increases the margin of error, provided the sample size and population standard deviation remain the same.