1. would you expect distributions of these variables to be uniform, unimodal, or bimodalSymmetric or skewed? Explain why..

a) Age of people at a little league game

b) number of siblings of people in your class

c) Pulse rates of college age males

d) Number of times each face of a die shows in 100 tosses

2. During his 20 seasons in the NHL, Wayne Gretzky score 50% more points than anyone who ever played professional hockey. He accomplished the amazing feat while playing in 280 fewer games than Gordie Howe, the previous record holder. Here are the number of games Gretzky played during each season:

79, 80, 80, 80, 74, 80, 80, 79, 64, 78, 73, 78, 74, 45, 84, 48, 80, 82, 82, 70

a) Do a stem and leaf display for these data using split stems

b) Describe the shape of the distribution

c) Describe the center and spread of this distribution

d) What unusual feature do you see? What might explain this?

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T 18. Population growth. Here is a "back-to-back" stem-and- leaf display that shows two data sets at once-one going to the left, one to the right. It compares the percent change in population for two regions of the United States (based on census figures for 1990 and 2000). The fastest growing states were Nevada at 66% and Arizona at 40%. Write a few sentences describing the difference in growth rates for the two regions of the United States. To show the distributions better, this display breaks each stem into two lines, putting leaves 0-4 on one stem and leaves 5-9 on the other. NE/MW States S/W States 6 -NNOWAAUDIOS O 001 6 001134 578 -2100 99998 876655 001134444 6999 4431 0 Population Growth rate ( 1616 means 66%)