Type F Is smoking during pregnancy associated with premature births? To investigate this question, researchers selected a random sample of 147 pregnant women who were smokers. The average pregnancy length for this sample of smokers was 262 days. From a large body of research, it is P known that length of human pregnancy has a standard deviation of 16 days. The researchers assume that smoking does not affect the variability in pregnancy length. Find the 90% confidence interval to estimate the length of pregnancy for women who smoke. (Note: The critical z-value to use, zc, is: 1.645) 10 por Your answer should be rounded to 3 decimal places.