Please help w/ questions 48 & 49

D Question 48 1 pts Imagine you are estimating the difference between two population means by comparing 95% confidence intervals. If you use the 2SE rule of thumb and have desired margin of error of 5 cm, what is the approximate minimum sample size for each of the samples if the population standard deviation is 15 cm? On = 108 On= 120 On = 132 On= 144 D Question 49 1 pts For a given population variance, what is the relationship between sample size and expected margin of error? There is a linear pattern (i.e., constant improvement) where larger sample sizes give larger margins of error. There is a nonlinear pattern (i.e., diminishing improvement) where larger sample sizes give smaller margins of error. There is a nonlinear pattern (i.e., diminishing improvement) where larger sample sizes give larger margins of error. linear pattern (i.e., constant improvement) where larger sample sizes give smaller margins of error