- One study finds that 86 deaths and birth effects among 202 pregnancies complicated by first trimester measles infection. Is it believable that the true proportion of abnormal births under similar circumstances could be as high as 50%?Answer the question by calculating the margin of error for the sample proportion, 86/202
if you are doing level II quant - go ahead and do that and post your questions here. This is not level II quant. looks more like Level I stuff - so go to the L I Forum please.