(30 min) STATISTICS
The second practice this week involves a brief review of statistics and a
competition on Functions and Relationships. The statistics review
homework is begun as an in-class exercise.
In dealing with a group of numbers, there are particular numbers that we
are interested in to give meaning to them as a group. Megan got these
scores on her quizzes: 5, 6, 8, 7, 9, 9, 10. What number best
she will do on her next quiz?
Minimum Smallest number 5
Maximum Largest number 10
Range Maximum minus minimum 5
Median Middle number (crossing
out largest and smallest) 8
Mode Most frequent number 9
Mean Average (sum/how many) 7.71
Which one do you like best? The answer depends on what you really want to
know. If you want to predict the lowest her grade might be, you would
choose the minimum. If the grade cannot be fractions or decimals, you
would have to choose the median or the mode, or round the average. You
might even want to give the more recent tests a special weighting if you
thought she was learning more in recent tests.