Algebra 1 Common Core Student Edition, Grade 8-9

2. Plot th e points (x, y - y ) on a coordinate p lan e sim ilar to th e one shown. y
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3. Do the points ap p e a r to follow a p attern? 1

@ 4. Writing Explain how you can use the residual plot to d eterm in e w h e th e r th e x
m odel function is a good fit for th e data. "o ^ 5 Ti

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5. You m odel two d ata sets using linear m odels. I h e resulting residual plots are
   show n below. W hich residual plot indicates th a t the linear m odel is a good fit for
   th e data? Justify your answer.

Plot A Plot B

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6. Use a graphing calculator to d eterm in e th e line of b est fit for th e data set below.
   Then use a residual plot to d eterm in e w h e th e r th e line of b est fit is a good m odel.
   Explain.

Latitude and Temperature in Selected Cities

Lag o s, Ni ger i a 6 89

Sa n Ju a n , Pu e r t o Ri co 18 84

Cal cu t t a, I n d i a 23 97

Ca i r o , Eg y p t 30 83

Tokyo, Japan 35 63

Ro m e, I t al y 4 2 68

Bel g r ad e, Ser bi a 45 45

Lo n d o n , En g l an d 52 56

Co p e n h ag e n , D en m ar k 56 50

Moscow, Russia 56 47

City Latitude (°N) Mean High Temperaturein A p ril (°F)^

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