Explanation for Question 8 From the Math (Calc) Section on the 2019 April Sat
So number eight is asking about results from a study. 2 So it says a city with 120,000 residents is voting on a proposal that 3 would eliminate overnight parking of vehicles on the city streets and independent company, 4 randomly surveys, 1200 residents to see whether or not residents would support this proposal. 5 The outcome of the survey shows that 60% of the residents surveyed approved of 6 the proposal with the margin of error of 2%, 7 which of the following statements is a plausible conclusion from the outcome of the 8 survey. So if we start looking at our answer choices here, 9 a says exactly 60% of city residents approved, 10 eliminating overnight parking the problem with a is that you have to 11 try to avoid where it's like exactly when you are taking results 12 from a study and applying them to an entire city. 13 We only surveyed 1200 residents. 14 So whatever the 1200 residents say is not going to exactly match what the 15 120,000 residents of the whole city say. 16 So a is incorrect simply because of the word. 17 Exactly. If it had said about that would make it a correct 18 answer since it leaves a little bit of wiggle room there for that percentage, 19 that if we look at B B is saying basically the same thing as 20 a, because 60% of 120,000 is 72,000. 21 So if B had said there are about 72,000 city residents, 22 that would make it correct, but it doesn't. 23 So B is not correct. Then C says about 2% of the city residents 24 do not approve eliminating overnight pa...