Is smoking during pregnancy associated with premature births

Last updated: 3/24/2024

Is smoking during pregnancy associated with premature births To investigate this question researchers selected a random sample of 107 pregnant women who were smokers The average pregnancy length for this sample of smokers was 265 days From a large body of research it is 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 ze is 1 645 Type numbers in the boxes Part 1 5 points Part 2 5 points 10 points Your answer should be rounded to 3 decimal places