***AP Statistics Thread 2016-2017***

@booksforbrains for Question 6 part a: (1/4, 1/8, 1/8, 1/4, 1/8, 1/8) then part ii: P(a&d) = 1/2 and part b: (1/6, 1/6, 1/6, 1/6, 1/6, 1/6) then part ii: was P(A & D): (2/6 or 1/3). part c: the chip method was the best way to do it, had to explain it or draw a tree diagram.

@32chubacka @GreenPoison Correct me if I’m wrong but I don’t think Chi-squared can establish an association, I think it was a linear regression test. Linear regression can establish an association and last year’s exam used Chi-squared, so there’s very little chance there would chi-squared on the inference portion two years in a row. Ages aren’t really categorical data bc you could average the range and make a linear regression based off of that. I didn’t spend more than 5 minutes on 5 bc I didn’t think it was chi-squared and I didn’t how to a linear regression test because we didn’t learn it in class. Do most teachers teach linear regression inference test?

We learned linear regression obviously, but we didn’t learn the hypothesis testing aspect of it.

It’s likely that most people missed that question, so I’m feeling a little bit better about getting a 5 now.

85+ should be a 5 right? Has an ap exam even ever been curved that little?

relax @PercyFowl . Every year, college board makes the curve ahead of the test. The highest the curve goes up to for a 5 is probably a 73. In a typical year it’s around 68, but this test was pretty easy.

And for the question you mentioned, anytime you’re giving a table with multiple sets of values in it you know it’s a chi-squared test. Additionally, association more less= relationship, which means it has to be an independence test.

LSSR is often the last thing teachers teach to students, so it is conceivable that a lot of students might miss it.

Furthermore, it is quite probable that we would get a chi-squared test question two years in a row for a frq. Last year, it was the second frq question. The question format for both these questions are almost exactly the same, which reinforces the likelihood that this year’s question was about chi-squared independence.

How much do you think a 4 is? Some say it’s 53, some say it’s 57. I messed up bad, so I wanna know if anyone knows the cutoff for a 4. Thanks

@ro2400 It changes from year to year, so it’s hard to predict, but this year it will probably higher than last year

the frq is released

Pretty straight forward FRQ’s l’ve seen in a while. Wish I saw the MC. I heard it was easy. Curve could be a small one this year. Good luck to everyone that took the exam!

Howd u guys do?

I got a 3, and I’m really not happy with that score. I did get a 5 on Computer Science A, however.

Hello,

I am currently a rising junior who doubled Pre-calculus honors and AP Stat my sophomore year. I didn’t find the class particularly hard. The class is not heavy in math, but rather more focused on your explanation and reasoning. Most of the formulas that you need to solve problems are given to you on a formula sheet both on the AP test and on class tests (they should be). If you’re taking the class, be prepared for a sore hand after tests, especially the AP Test.

Tips for the AP test:
Manage your time well on the FRQ. The format is 5 short answers and 1 long answer. Collegeboard recommends that you spend about 12 minutes on the 5 short answers and 25 minutes on the long answer. Personally I think those recommendations for the short answers are generous. I found myself spending about 6 minutes on each short answer. Furthermore, you will want to allocate more time on the long answer. This question is known as the experimental question because Collegeboard throws a question that requires higher order thinking. I recommend spending 25-30 minutes on this question.

I believe neither the test nor the class is that hard. I earned a 5 on the AP test and I’m sure you guys will be able to as well.