A survey of 250 young professionals found that one-third of them use their cell phones primarily for e-mail. Can you conclude statistically that the po proportion who use cell phones primarily for e-mail is less than 0.40? Use a 95% confidence interval. The 95% confidence interval is . As 0.40 is 0.40. of the confidence interval, we conclude that the population pro (Use ascending order. Round to four decimal places as needed.)