Astudy was conducted to determine the proportion of american teenagers between 13 and 17 who smoke. previous surveys showed that 15% percent of all teenagers smoke. a gallup survey interviewed a nationally representative sample of 785 teenagers aged 13 to 17. seventy-one teenagers in the survey acknowledged having smoked at least once in the past week. does the study provide adequate evidence to conclude that the percentage of teenagers who smoke is now different than 15%1. are the requirements for both a confidence intervale and a hypothesis test met? 2. determine the appropriate 95% confidence intervale for the true proportion of teenage smokers. input your answers for the margin of error, lower bound and upper bound.

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )