Question: Sample Problem on Comparing Two Means: A National Center for Health Statistics data brief published in 2015 (Nr. 181) looked at the association between lung

Sample Problem on Comparing Two Means:

A National Center for Health Statistics data brief published in 2015 (Nr. 181) looked at the association between lung obstruction and smoking status in adults 40 to 79 years old. In a random sample of 6927 adults without any lung obstruction, 54.1% never smoked. In a random sample of 1146 adults with lung obstruction (such as asthma or COPD), 23.8% never smoked.

a. Find and interpret a point estimate of the difference b/n the proportion of adults without and with lung obstruction who never smoked.

b. Find a 99% confidence interval for the true difference. Interpret.

c. Do the significance test for this study. Assume 99% confidence level.

I tried watching it on Youtube but I got confused even more since this problem had percentages :(

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