AP Statistics Exam Final Thoughts

Your AP Statistics Test is Thursday afternoon. Be outside York Lecture Hall by 11:50 with your calculator and pencils (non-mechanical, remember!). Do not bring your backpack, bag, or your cell phone (or any other “smart” device like watches); find somewhere to put them. You may bring a snack or water, but it must be in clear packaging and you may not have it at your desk with you. Do not expect to leave until at least 4:00!

See this post from before with the archive of review materials.

Things you should be sure to remember (these are my thoughts, see pages 608-610 of your review book for some further points):

  • The formulas for the mean/standard deviation of a sampling distribution of means and a sampling distribution of proportions are on your formula sheet. Whenever you’re being asked to calculate a mean or a standard deviation, check to see if it’s one of these.
    • Related: Pay attention to which standard deviation you are being asked to calculate. The standard deviation of a sample is not the same thing as the standard deviation of a sampling distribution.
  • Probability questions will come in three categories
    • Direct calculation based on a finite sample space (like rolling dice). Write out all the possible outcomes and count which ones are the ones you want. This also includes two-way tables. Don’t try to use fancy formulas for those; just count!
    • Number of successes questions. For example: “how many model E cars would you expect to see in a 2000 car sample?” or “what’s the probability that at least one out of the four drivers is speeding?” These are applications of the binomial probability model and should be calculated appropriately using the formulas on your sheet.
    • Number of trials questions. For example: “how many chips would you expect to need to check before finding a defective one?” or “what’s the probability that the 5th donor is the first with Type-B blood?” These are applications of the geometric probability model. The formulas are not on your sheet, and so you should memorize them: q^(K-1)*p for a general probability and 1/p for the expected value.
  • Know how to combine the standard deviations of two or more random variables. Remember: variances always add.
  • Know how to read the regression output of a linear association. What do “constant,” “estimate/coefficient,” “prob” all mean? Refer to pages 111-112 in your review book or page 729 in your textbook.
  • Know the difference between stratified and cluster sampling and how to identify/use them. Also remember that for a simple random sample every possible sample has the same chance of being chosen.
  • Know the important conditions for each of the inference procedures:
    • Everything: Random Condition
    • Any z-test: Success/failure condition
    • Any t-test: Nearly Normal/Large Enough condition
    • Any chi-square test: Expected cell frequency condition
    • Any 2-sample/2-proportion test: groups are independent from each other.
    • Also: know when to use a 2-sample t-test vs. a matched pairs t-test
  • Be mindful of notation. Don’t use x-bar when you should be using µ. Don’t use p when you should use p-hat.
    • Related: No Naked Numbers! Every number included in any response should have a label somewhere (mean, standard deviation, p-value, etc.)
  • Context, context, context. Always frame your answers in the context of the situation. Don’t say, “I am 95% confident that the true proportion of success is between 22% and 37%.” Say instead: “I am 95% confident that the explosive sensor will accurately detect hidden explosives 22% to 37% of the time.”
  • Be complete with your responses. When choosing between two possibilities in a free response question, explain why one possibility is wrong and why the other one is correct. When asked to compare two distributions, make explicit comparative statements, e.g, “Group 1 is centered at around 12, which is greater than Group 2, which is centered around 7”
  • At the same time, don’t give more information than is requested. If the question asks you to describe the shape of a distribution of data from a histogram, don’t discuss center and spread. If the question asks you to explain your randomization procedure for an experiment, you don’t need to explain what the response variable is, how you’re going to measure it, and what a statistically significant outcome would look like. If the question asks you to merely calculate a confidence interval, you don’t have to interpret it.

AP Statistics Pre-exam breakfast

Ms. Seifert and I would like to invite you to a pre-exam breakfast and review session in her room, H213, on Thursday. We’ll start things up around 8:40 for those of you who don’t have 1st period free, and we’ll spend 1st period hanging out and answering any lingering, last-minute questions you may have.

We plan to get bagels, but if you have dietary restrictions (gluten free, vegan, etc.) please indicate them on this form by the end of the day!

AP Statistics Assignment for Week of 5/13

Your AP exam is on Thursday, in the afternoon. Between now and then, what we do for review is largely up to you. I’ll have some ideas here and there, but I’ll expect you to ask questions and guide what we do for these last few days.

Tonight, you should take a look at the AP Exam tips on pages 608-610. We’ll do some more review with AP multiple choice questions in class tomorrow, but after that it’s up to you!

AP Statistics Assignment for 5/8 & 5/9

By Friday, complete the 2014 released Free Response Questions. On Friday, you’ll get into grading groups and score your peers’ responses according to the scoring rubric. Note that this is a different exam from what appears on your review calendar.

This grade will not be counted towards your marking period average. Please do not review the solutions to these problems. Let this be another opportunity to practice the free response section of the exam. Spend no more than 1.5 hours, and use no resources other than your calculator and formula sheet.

Write all of your answers on blank sheets of paper. More than one solution per page is fine; we’ll staple them together in class. But please make it neat! Your peers will be reviewing your work!

AP Statistics Assignment for 5/7

We reviewed the binomial and geometric probability models today, along with sampling distribution models for proportions and for means. Tonight, please do the following

In addition, I’d recommend you look at section 10 from your review book.

Review my answers here before class tomorrow so we can address any lingering questions you may have more efficiently.

AP Statistics Assignment for 5/6

We did some review of probability today, in particular parts of chapters 14 and 15 of your textbook. Your homework tonight is:

In addition, I’d also recommend you look at Question 3 from the 2008 Free Response, as well as Section 8 of your review book.

Review my answers here before class tomorrow so we can address any lingering questions you may have more efficiently.

AP Statistics Assignment for 5/1

We will have an in-class quiz assignment tomorrow, where I’ll put you in groups and give you an investigative task from a past AP exam to work on. You’ll have the whole period to work on it, but you won’t be allowed to use your notes or text: only your own effort (and the formula sheet).

In preparation, take a look at the Investigative Task section of your review book (Topic 14), then work on questions 1, 3, 6 from problems starting on page 403.

AP Statistics Assignment for 4/30

We reviewed the Linear Regression t-Test, our test for association in quantitative data. Your homework is:

Please review my answers here before class tomorrow so we can more efficiently resolve any lingering questions you may still have, and spend most of the period tomorrow talking about the multiple choice section of the practice AP.

AP Statistics Assignment for 4/29

As we start the next phase of our review for the actual AP exam on May 16, we will be starting with the top two review requests from the survey I ran over the weekend: Unit 7 (Chi-squared and linear regression tests), and Unit 4 (Probability). This review will feature mostly in-class examples and discussion, followed by select AP free response questions as homework. The rough schedule for these next three weeks can be found here.

Today, we reviewed Chi-Square tests. Your homework is:

Please review my answers here before class tomorrow so we can more efficiently resolve any lingering questions you may still have.

AP Statistics Review Information

Key Dates

  • Thursday, April 25, 8:00 am – Practice AP Statistics exam (York Lecture Hall)
  • Thursday, May 16, 12:00 pm – Actual AP Statistics exam (York Lecture Hall)
    • For both exams, bring your calculator and pens/pencils (preferably only pencils, and no mechanical pencils).
    • Do not bring cell phones, backpacks, bags, or any other items. Food and water bottles are permitted, but must be left at the front of the room and can only be accessed during breaks.

Review Materials

AP Statistics Review Phase 1

Our review for the AP Exam has started. Phase 1 will take us to the practice AP exam on Thursday, April 25th at 8:00 am in York Lecture Hall. More details will be posted soon.

The review calendar for the first part can be found here. Most of this review will be done out of the Barron’s review books you have obtained, so plan on bringing those to class for the first several days of review. There is a lot more to these books than we plan to do in class, so please continue to work through the practice tests and other chapters on your own.

AP Statistics Assignment for 4/5

This weekend, complete the Chapter 25 Investigative Task, using the tests you settled on in class today. If you want to change your mind about which test you use to answer each question, that is okay! Just include an explanation of why you are changing your mind.

As usual, your response should be completed in a Google Document and submitted to me (bkirk@icsd.k12.ny.us) by the start of class on Monday. Please name your file appropriately.  The file name should have the format “LastName.FirstName.Ch25InvTask”. For example, mine would be “Kirk.Benjamin.Ch25InvTask”.

Finally, if you have not yet shown me your purchased copy of the Barron’s AP Statistics review book you must have for our AP exam review (or sent me a selfie with both you and the book), please do so by Monday.

AP Statistics Assignment for 3/28

You knew this was coming! Tonight, please complete the Chapter 24 Investigative Task – SAT Part II. Use the same sample you selected for the previous task (though here’s the sampling frame again if you need to gather a new sample) and submit your response to me by the start of class tomorrow.

As usual, your response should be completed in a Google Document and submitted to me (bkirk@icsd.k12.ny.us). Please name your file appropriately.  The file name should have the format “LastName.FirstName.Ch24InvTask”. For example, mine would be “Kirk.Benjamin.Ch24InvTask”.

Finally, it’s getting to be about time where we will start reviewing for the AP exam. We will be using the 9th edition of Barron’s AP Statistics review book to aid our review process. Please purchase a copy of this book by Friday, April 5th. By Friday, either bring in your book or take a selfie of you holding it with your name clearly written across the front. Every student must have their own copy of this book, that you can write in and mark up as we go through our review. If you are concerned about obtaining your own copy (for whatever reason), please contact me ASAP and we’ll work out an arrangement.

AP Statistics Assignment for 3/27

You met with a group of peers in class today to look at a set of review problems from both Unit 5 and Unit 6. Your assignment tonight is to complete the inference procedure suggested by each question. You must do each question your group assigned to you in its entirety on separate pieces of paper. When we get back to class tomorrow, you’ll have time to check in with your group before stacking the problem sheets, stapling them together, and turning them in to me.

If you weren’t in class today, then pick any three of the problems in the file linked above, complete your response, and turn them in.