Categories
Statistics Technology

A Bowl of PASTA with Stats Friends

Today I attended the winter meeting for one of my favorite organizations: PASTA, the Philadelphia Area Statistics Teachers Association.  This group meets a few times a year to discuss best practices in statistics education, and includes a number of AP teachers, many of whom are AP exam readers.  As always, lots of interesting ideas today:

Joel Evans, from my home school, spoke on his first attempts to “flip” his AP Statistics class.  Based on feedback from his students, Joel realized that Powerpoints often dominate his classroom culture.  By flipping, Joel hoped to have students review material before class, then use class time to practice and discuss.   Follow Joel’s flipping story in the slides below.

It is always a pleasure to have Daren Starnes at our meetings.  Daren, one of the co-authors of the ubiquitous The Practice of Statistics textbooks, joins our group often to discuss his ideas for teaching statistics.  Today, Daren shared a presentation, “50 Shades of Independence”.

Daren asked us to think about all of the places where we encounter “independence” in AP Statistics:

  • probability of independent events
  • independent trials
  • independent random variables
  • independent observations
  • independent samples
  • independent categorical variables (chi-squared)

Man, that’s a lot of independence!

Which items from the list above deal with summarizing data?  Which are needed for inference?  How are they related?  How do we help our students understand the varied, and often misunderstood, meanings of independence.

Daren has a knack for leading conversations which invite participants to express and discuss their math beliefs. Daren   Many of the arguments concerning independence, according to Daren, are “overblown”, in that teaching them in a cursory manner often causes us to lose focus on the big picture. That’s not to say that we should discard them, but that, when teaching inference, we should have students focus on items which would cause a hypothesis test to be “dead wrong” if we didn’t mention them, i.e. randomness, justifying normality conditions.

penniesRuth Carver continued the presentations with some new tech twists on a lesson used by many stats teachers: analyzing sampling distributions by looking at the age of pennies.  A population graph of the ages of 1000 pennies hangs proudly in Ruth’s classroom.

After agreeing that the population is clearly skewed right, we move to the main event – drawing random samples from the population and analyzing the data we get from repeated samples of the same size.  Ruth has developed a lesson for the TI Nspire which generates the samples, and challenges students to think about the behavior of the sampling distributions, now considering the effects of sample size.  Ruth’s presentation allows students to experience and express the differences between:

  • Standard deviation of a population
  • Sample standard deviation
  • Standard deviation of a sampling distribution

Ruth

Great job Ruth!  Looking forward to more PASTA with my stats friends!

Categories
Uncategorized

Worksheets and Differentiation – Not Always Mutually Exclusive!

I hate worksheets.

Is there anything worse than a math classroom where the pace and expectation are dictated by the almighty worksheet?  OK class, continue working on the blue worksheet, and homework will be on the pink worksheet.  Tomorrow, we will do test review with the aqua worksheet.  And then we will have a whole new chapter packet to work on….blah….

Don’t get me wrong…I’m not anti-practice.  Much of math is like learning to play the piano, you need to expend some sweat in order to master skills.  But, like playing the piano, all students will master the skills differently, with different timelines.  And, like piano players, some students will handle rigor and improvisation quicker than their peers.

So, how do we provide students with appropriate practice, while at the same time allowing students to have some say in their learning, assess their own progress, and provide for differentiation? Here are two strategies for you to try:

POINT-VALUE ASSIGNMENTS

In this strategy, students are not required to complete all assigned problems (unless they choose to). Instead, problems are assigned individual point values, and students complete enough problems to earn the assigned number of points. Easier problems have smaller point values, while more challenging ones are worth more.

Here’s an example, which use the Linear Functions Review given here (pdf): Linear Functions Review

This review has 18 problems, increasing in difficulty.  One way to assign point values would be:

  • Problems 1-7, 1 point each: these problems can be done mostly by looking at the linear pattern and providing a quick answer.
  • Problems 8-14, 2 points each: these problems mostly ask students to match function rule to situations.
  • Problems 15-18, 3 points each:  open-ended, and all require students to develop a function rule.

For this assignment, I would ask students to complete 12 points worth of problems.  This would require students to reflect upon their understanding, and provide differentiation.  How could students complete the assignment?

  • Students at a basic level could complete all 1-point problems, but would then also need to complete at least 3 of the 2-point problems (of their choice).
  • Students comfortable with the material could complete a mix of 1, 2 and perhaps 3-point problems.
  • Students at the advanced level could complete only all 4 of the 3-point problems.

The worksheet provided here was created uses the fantastic site Problem Attic, developed by EducAide software.  The site has a large bank of problems from various state, national and international assessments, and allows users to create their own customized assessments.  Definitely worth checking out!

CHOOSE-YOUR-OWN PATH

Many textbooks (particularly high-school texts) will arrange their problems sets into A, B and C levels.  Do I need to see students complete all problems from a set?  If a student demonstrates mastery of a C-level problem, do I really need to see them complete many A and B level problems?  This strategy allows students to choose the best path for completing an assignment, using this template:

Choose a Path

In this assignment, all students start with a B problem, then choose their own path for completing the assignment, by selecting one of 3 colored paths.   This could mean completing a few A problems, with a few B problems.  Other students many choose the series of B problems, with a few A’s sprinkled in.  Ambitious students may choose the challenging C problem to complete.

With both strategies, students are challenged to reflect upon their own learning, make appropriate choices, and take responsibility for their progress.  Classroom expectations don’t change at the drop of a hat, and may take a few conversations and failed attempts before working the way you like.  But they payoff, increasing student responsibility and reflection, are worth the pain.

Categories
Algebra Middle School Statistics

Ring in the New Year with Fun Classroom Lessons!

Now is a good time to reflect upon the past year, and think about all of the professional growth I have made through the people whose ideas I have shared and experienced through the twitter-sphere and blog-o-sphere (are these actual words?), and to send thanks from all of the new math friends I have made.  I took a look back at all of my posts from the previous year, and here are 5 great activities you can use tomorrow is your classroom.  Share them, adapt them, expand upon them…it’s all good.  Just pay it forward and share your best works, or leave a comment /contact me and let me know if you use them!  Enjoy.

Conic Sections Drawing Project – this was the most popular post of the year.  For algebra 2 or pre-calc, this project just got better with the Desmos online calculator, which is my favorite new tool of the past year.

Tapping Into the Addition of Bubble Wrap – bubble wrap, iPads, and slope meet for a fun exploration.   Look at rate of change through student-produced data.

Tall Tales for Probability – Featuring the poker chip drawing game, and examples from the Amazing Race and craps.  Probability should be fun.  Make it so!

Let’s Play Plinko! – I have used Plinko as an introduction for binomial distributions for years, but in this presentation from last summer’s Siemens STEM Academy, tech tools like PollEverywhere and Google Drive are used to increase interaction.

Composite Functions and ESP – Use this activity with middle-schools and see if they can develop the pattern.  For high school, have students write and justify their own ESP puzzles.  Also features Doceri, another favorite new tool of mine, for iPad.