A stop-sign vs. a stoplight; when does each make sense? (Part 2, Math modeling)

I know it’s been a while since we visited this, but quick recap: We want to figure out when it is appropriate to have a stop-sign at an intersection versus a stoplight. In Part 1, we made some assumptions about stop-sign wait time modeling and developed an equation that gave us the total wait time … Continue reading A stop-sign vs. a stoplight; when does each make sense? (Part 2, Math modeling)

What Teachers Want: An Education Parable Written By a Math Teacher

Our scene opens with the Teacher and the Student in a moderately decorated classroom. The walls are covered with posters, both inspirational and informative. The Student is seated at one of dozens of neatly aligned desks, facing the Teacher, who stands in front of a whiteboard covered in information, examples, and tasks. The Teacher is … Continue reading What Teachers Want: An Education Parable Written By a Math Teacher

Let’s graph this and/or make it better; What constitutes a “blown game?”

A few minutes ago the other day, NPR's Mike Pesca tweeted his mathematical rule as to what constitutes a "blown game" in basketball. That means if at any time a team is winning by (# of minutes left in the game)+4, and loses, that's a "blown game." There are 48 minutes in a NBA game … Continue reading Let’s graph this and/or make it better; What constitutes a “blown game?”

A stop-sign vs. a stoplight ; when does each make sense? (Part 1, Math Modeling)

Artifact Can we use math modeling and/or equations to answer the question of when it becomes advantageous to install a stoplight vs. a stop-sign? Can we "ambush" students by having them create equations without really knowing it? What are some of the things we need to know about this? Guiding Questions How long does a … Continue reading A stop-sign vs. a stoplight ; when does each make sense? (Part 1, Math Modeling)

Can you predict how many followers @charliesheen has right now? ; Exponential growth? (Part 2)

Be sure to check out Part 1 of this post, when the activity was assigned (i.e. if you were absent from E/M yesterday). There I provided my data on the number of Charlie Sheen's twitter followers and the time. I hypothesized that it would be a more-or-less exponential growth curve. I'll break this up into a few … Continue reading Can you predict how many followers @charliesheen has right now? ; Exponential growth? (Part 2)

Can you predict how many followers @charliesheen has right now? ; Exponential growth? (Part 1)

Sometime on March 1, 2011, Charlie Sheen joined twitter at the suggestion of Piers Morgan, who is apparently some type of person. By the time I was alerted of the existence of a @charliesheen twitter feed, it was 4:04 PM Mountain Standard Time. Sheen had yet to tweet, but already had somehow amassed over 100,000 followers. He … Continue reading Can you predict how many followers @charliesheen has right now? ; Exponential growth? (Part 1)

Is there anything wrong with this graph? ; Looking for a good economist

I'm trying extremely hard to stay out of the comentariat concerning education. My love is instruction, not politics. Students, not funding. Engagement, not class sizes. So with that in mind, let's take a look at this graph presented by Bill Gates. Now, I'm not an economist, so can one of you out there that is … Continue reading Is there anything wrong with this graph? ; Looking for a good economist