Quiz 4.2B

# Quiz 4.2B - and the other omits the influential...

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QUIZ 4.2B AP Statistics Name: Here are the golf scores of 11 members of a women’s golf team in two rounds of tournament play: Player 1 2 3 4 5 6 7 8 9 10 11 Round 1 89 90 87 95 86 81 105 83 88 91 79 Round 2 94 85 89 89 81 76 89 87 91 88 80 Here is a scatterplot of the data with the Round 1 scores on the x axis and the Round 2 on the y axis. Player 1’s scores are marked with an × . 1. There is a generally linear pattern except for one potentially influential observation. Circle this observation on the graph. Then explain what is an influential observation. 2. Here are the equations of two least squares lines. One of them is calculated from all 11 data points,
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Unformatted text preview: and the other omits the influential observation. y 1 = 20.49 + 0.75x y 2 = 50.01 + 0.41x Sketch both lines on the scatterplot, and identify them as y 1 or y 2 . 3. Circle the equation of the line that omits the influential observation. 4. Explain how you knew the answer to problem #3. People who use artificial sweeteners tend to be heavier than people who use sugar. Does this mean that artificial sweeteners cause weight gain? 5. Give a more plausible explanation for this association. Chapter 4...
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## This note was uploaded on 12/26/2009 for the course MATH 212 taught by Professor Mr.brown during the Spring '09 term at Louisiana College.

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