We wish to give a 90% confidence interval for M. Here, / denotes the mean value of a normally distributed random variable Y. In order to develop this confidence interval we have obtained a random sample of 5 elements from the population on which Y is defined. The data for the sample are Y=8,12,14,16,20. Give the margin of error for the 90% confidence interval for M. O 2.132 O 4.264 O 3.290 O 3.92 O 14