BrownMath.com → Statistics → Sum15 ME58 → Broadcast Emails
Updated 24 Jul 2015

Emails to the Class

Summary: Broadcast mails are sent to your TC3 address. They’re also archived here for those who may be having mail problems.

Please check your mail frequently. (If you’ve set up forwarding to another address, you still have to log in to your TC3 email at least once a semester or the account will go inactive.)

Contents:

24 Jul: Thanks for your feedback!

Greetings, statistic whizzes!

Thanks for taking the trouble to fill in the Course Debriefing. I’ve collated the results, and if you’re curious you can see them at http://BrownMath.com/stat15b/evalresp.htm.

Just a reminder: If you haven’t donated to the textbook yet, please consider doing that. Go to http://brownmath.com/swt/ and click on the link at the bottom of the page.

Have a great summer, and best wishes for your further studies!

17 Jul: Grades have been posted!

Greetings, statistic whizzes!

Grades have been posted. The median was 78%, mean 81%, SD 32%; there were 2 A’s and, I’m happy to say, no F’s. You can pick up your grades at myTC3/myInfo, or request a detailed computation from your TC3 mail account.

Now that the course is over, and you know it won’t affect your grade, please consider donating some money for the use of the textbook. You can probably tell that I’ve spent a lot of time on it, and I even pay the hosting fees out of pocket. This free resource saved you $186.50 new or $140 used at the TC3 bookstore. If you’d like to make a donation, please go to http://brownmath.com/swt/ and click on the link at the bottom of the page.

Thanks for your hard work, and have a great summer!

28 Jun: Requirements check!

Greetings, statistics buffs!

I’ve finished scoring the quizzes, and one big trouble spot sticks out: the requirements check. On this quiz, the requirements check was 30% of the points for each problem. You really do need to test requirements for every problem involving a sampling distribution. Chapter 8 problems involve a sampling distribution directly; Chapters 9 through 12 involve sampling distributions indirectly.

The solutions to the homework problems all wrote out the requirements checks, often with bullets for the three requirements. If you’re in the habit of just checking your answers, I recommend you read over the solution (after working the problem yourself) to make sure your solution method is correct and complete.

A second trouble spot, for just a few of you, was not even using the standard error on the two problems with numeric data. For every problem, you need to think about whether you’re computing a probability for individuals in the population, or a probability for finding sample means in a certain range.

You did good work on the probability labs: everyone got at least a C, and there were four A’s. Well done!

17 Jun: Quiz times

Greetings, statistics buffs!

Many of you took double the normal time tonight. The “normal time” isn’t something I make up; it comes from the time students actually spent on similar problems in the past.

Time to work problems is an important indicator of how well you know the material. Ask yourself: Did I study the chapter thoroughly? Did I work each example in the chapter with pencil and paper or calculator, as opposed to just passing my eyes over it? Did I do all the homework problems? Did I write out every step the way I would do for a quiz? Did I work each problem before I looked at the solution? To prepare for the quizzes, you need to be able to answer an honest and unqualified Yes to each of those questions.

Part of the deal with having the quiz at the end is a reasonable amount of extra time if you want it, but the key word there is reasonable. Five minutes extra is reasonable; 20 minutes is something else. We’re not going to stretch the time so far out after tonight.

I know that every one of you is capable of doing well on the quizzes. And I know that the course moves very fast in the summer. So please be good to yourself and budget the time you’ll need to do the necessary prep. For the average student, that’s 12 to 18 hours a week, 6 to 9 hours per class.

And never forget, if you have any questions I’m only an email away.

6 Jun: Keys to Success

Greetings, statistics buffs! Just a reminder — Your To-Do List on the back of your schedule is your checklist for what you should do between classes.

I know we have a lot of work to do in a short time, but that’s the price we pay for getting through the course quickly. Please plan your time to read the whole textbook chapter — yes, you really need to do it. And since this is technical stuff, you need to re-read the parts you don’t understand the first time. See How to Read a Math Book, linked from What Have You Learned? near the end of the chapter.

Several of you were struggling to find calculator keys during class. Again, be nice to yourself and pracice beforehand! Follow the keystrokes in the examples in Chapter 4 and make sure that your screens look like the ones in the book.

6 Jun: Calculator and MATH200A Program

Greetings, statistics buffs! If you didn’t have your required calculator Wednesday, hopefully you have it now.

You don’t need to wait till Monday to get the program. See Getting the Program, which is linked from the first paragraph under Box-Whisker Plot on TI-83/84/89.

You can also perform a boxplot without the program; see Box-Whisker Plots on TI-83/84, linked from the same paragraph of the book. If you use this procedure, make good notes on your cheat sheet so you’ll remember it during the quiz. (As I mentioned in class, the book gives you a non-MATH200A alternative for every MATH200A procedure. MATH200A just saves you work; it doesn’t make impossible things possible..)

1 Jun: Chapter 1 Quiz, Chapter 2 Homework

Greetings, statistics buffs! I’ve posted the solutions to the Chapter 1 quiz on the class Web page: http://BrownMath.com/stat15b/
I’ll do this every night when I get home from class. I’ll update the news items on the Web page, but I won’t send out an email.

Chapter 2 homework will be inspected before class (if you’re early) or during the quiz on Wednesday. You don’t need to write down the questions, but you do need to show your work. For instance, if you’re making histograms or bar graphs from raw data, you need to show the tallies.

17 May: Welcome to Statistics!

Greetings, statistics buffs! I’m looking forward to meeting you in a little over a week.

For those who like to plan ahead, I want to let you know what you’ll need for the class.

Our textbook is Stats without Tears, a free textbook available at http://BrownMath.com/swt and also linked from the class Web page http://BrownMath.com/stat15b/. You can read the chapters on line or print them. If you print them, I suggest black-and-white two-sided printing.

It’s on the Web and free, but it’s still a real textbook and you do need to study each chapter carefully.

You don’t need a commercial textbook, and you don’t need MyMathLab.

You do need a calculator, namely a TI-83 Plus, TI-84 Plus, TI-83 Plus Silver Edition, or TI-84 Plus Silver Edition. Buy on price; the few additional statistics features in the TI-84 Silver are not significant for our class.

Most of the “big box” retailers carry TI-83s or TI-84s, and if you have the option of shopping there you can usually find a bargain. New and used ones are easy to find on the Web, or you can rent one at rentcalculators.org or similar sites.

Yes, you can borrow a calculator from the Baker Commons if you forget yours on class night, but you need one available all the time. Without it, you’re much less likely to do the homework and much more likely to flunk the quizzes and the exam.

Please have your calculator at the first class meeting.

This isn’t a Web-based course, but most handouts and all quiz solutions will be distributed through the Web. You might want to bookmark http://BrownMath.com/stat15b/ in your Web browser. While you’re there, feel free to have a look around.

If you have any questions about anything, please feel free to email me at Browns@tc3.edu. I usually respond to emails once or twice a day.

See you on the 27th!

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