mymath.com ourse Forums Calendar | Gradebook Log Out AMAT 108 Elementary Statistics Assessment Homework 5b: Confidence Intervals Score 2/10 3/10 answered Questions Scone on last try of 1 pts. See Details for more Next question Get a similar question You can retry this question below The age when smokers first start from previous studies is normally distributed with a mean of 13 years old with a population standard deviation of 18 year old. A survey of smokers of th generation was done to estimate if the mean age has changed. The sample of 28 smokers found that their mean starting age was 13.5 years old Find the 90% ondence interval of the man Do not round in between steps Round was decimal places Question Help D Submit Quenon mps lock 0 ON A 3 E E 54 MacBook Air % A & 5 6 7 22 70 R T Y U S D LL F G H Z X C V B N control option command You are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on constructing a confidence interval; however, you are not sure how many citizens should be included in the sample. If you want your sample estimate to be within 3 years of the actual mean with a confidence level of 98%, how many citizens should be included in your sample? Assume that the standard deviation of the ages of all the citizens in this community is 22 years. Sample Size