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# Early Solutions for the 2019 AP Statistics Exam

Updated: Aug 9, 2023

The College Board typically releases the free response questions for the AP Statistics Exam the Saturday following the exam. Starting early in the morning, we feverishly refresh the College Board website like we're trying to buy tickets for a Justin Timberlake concert. Once they are revealed, we spend Saturday afternoon writing up solutions and hypothesizing what the rubrics might look like. So here goes with our first attempt at solutions (please be gentle if we have any errors!)

## QUESTION 1: DORM LIFE

2019 AP Statistics FRQ #1

## QUESTION 2: INSECTS AND FUNGI

2019 AP Statistics FRQ #2

## QUESTION 3: GENDER AND MEDICINE

2019 AP Statistics FRQ #3

## QUESTION 4: TUMBLEWEED AND GLYPHOSATE

2019 AP Statistics FRQ #4

## QUESTION 5: SMARTPHONE BATTERIES

2019 AP Statistics FRQ #5

## QUESTION 6: EMMA'S BOOTSTRAPS

2019 AP Statistics FRQ #6

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## 4 Comments

wlinville
May 22, 2019

Thanks! And thanks for all the amazing work you do to provide all the materials on this site. I hope they don't get too technical on the rubric, but the median is between 225 and 275 in #1. The 10th and 11th values are in different bins, and the median is the average of the two -- so the smallest it could be is (200 + 250)/2 = 225 and the biggest it could be is (250 + 300)/2 = 275.

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Daniel Grossman
May 21, 2019

I don't think that's right for number 6 f. The wording of the question suggests that you use the 96% from "e" but my understanding of the bootstrapping process this value is not our confidence level... my understanding is the initial process is designed for us to be 90% confident. https://en.wikipedia.org/wiki/Bootstrapping_(statistics) http://www2.stat.duke.edu/~banks/111-lectures.dir/lect13.pdf If you imagine running this simulation longer, we'd expect get more samples in the middle, and certainly fewer on those key values of 2500 and 2950....over say 1,000,000 simulations, we'd expect that closer to 90% of our sample medians are in that 5-95 range. Using the logic from the model answer above, this would suggest that we would be more confident in our 15,000 simulation interval (96%)â€¦

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szorn
May 20, 2019

How did you get the solutions for 6 d-e? Is there any way you could break it down a little bit more? New AP Stats teacher here!

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nmarincel
May 20, 2019

This is really helpful! Question: for question 2c, should you put 01 to 20?

Thanks!

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