As I said in my last post, I’m busy working on the new edition of the Math Guide for the new SAT. Here’s another quick pair of graph questions for you to try out.

You don’t need to be a site member to take this little quiz, but I’d encourage it. Site membership is free, and if you’re logged in all the quizzes you take will be stored. If you take enough of them, that adds up to useful data for you to see where your strengths and weaknesses are.

The next two questions refer to the following information.The owner of a hair salon is able to use his website’s analytics feature to track roughly how far visitors are from his hair salon, and how long those visitors stay on the website. Above is a scatterplot the salon owner made of the first 40 visitors to his website on a particular Saturday, and the line of best fit for that data. (You can click the graph to see a bigger version in a new window.)

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X axis says restaurant?

Oops! I guess you have some insight into the evolution of this question. 🙂

I’m fixing it now.

Oh man, tips for people from a person who learnt very quickly on how to interpret graphs quickly:

Look at the units and don’t make assumptions (if I looked at units, would have gotten #2 right).

Don’t let your eyes fool you, if you are looking at what number on the best of fit line corresponds to 4 miles away, draw an imaginary line from the right side instead of the left- this question is significantly harder on computer.