QUESTION 4 Calculate the margin of error for the following condence intervals: 1. 99% condence. population standard deviation is 500, n is 100. Margin of error = 2. 98% condence, sample standard deviation is 125, n is 25. Margin of error = Final answers rounded to the nearest whole number. QUESTION 5 Calculate the standard of error of the mean for the following: A sample of 81 items is selected from a population of 400 which has a standard deviation of 54. Final answer rounded to one decimal place. Standard error = [a] QUESTION 6 A sample of 200 students indicated that 120 preferred strawberry icecream to vanilla icecream. 1. What is the sample proportion of students who preferred strawberry icecream? 2. Calculate the standard error of the proportion. Round answer to 3 decimal places. 3. At the 90% condence interval, calculate the margin of error. Round answer to 2 decimal places. 4. What is the upper limit in this confidence interval