Illinois State University Mathematics Department

MAT 312: Probability and Statistics for Middle School Teachers Spring 1999 |

Calculator Assignment: Due Tuesday 19 January 1999 |

For questions 1 and 2, I ought to be able to look at your calculator and examine your work. You should have the data saved in lists L1, L2, and L3 and you should have enteredStat Plotinfo to create a histogram for each of the three data sets.Here are sample written responses for questions 3 through 6.

Task #

Value/Question

L1: Number of Consonants

L2: Shoe Length (cm)

L3: Arm Length (cm)

3mean3.68 25.76 38.44 median4 26 38 mode4 21,26,27,28,29 30,31,32,38,44,46,47 Do the three values differ?No. There is a high concentration of values at 3, 4, and 5, the middle of the data set.

The mean and median are very close to each other. One of the modes matches the median. Four others values occur equally as often, three of them close to 26.

The mean and median are close to each other. One of the modes matches the median. Five others values occur equally as often, spread out from the median.

4upper quartile4.5 28 45.5 lower quartile3 23 31.5

5range5 11 22 interquartile range1.5 5 14

6upper fence4.5+(1.5)(1.5)=6.75 28+(1.5)(5)=35.5 45.5+(1.5)(14)=66.5 lower fence3-(1.5)(1.5)=0.75 23-(1.5)(5)=15.5 31.5-(1.5)(14)=10.5 outliersnone none none