7.1 & 7.2 Quiz Review

September 8th

Tomorrow’s Quiz

• You may use your notes

• Each blank is worth 5 pts

• Read all directions / instructions

From 7.1…

• Scatterplots

• Positive or Negative Correlation?

• Estimating a line of best fit

• I will not ask for correlation coefficients (-1, -0.5, 0, 0.5, 1)

MEDIAN-MEDIAN LINE

• Put these steps in your notes…

• 1) X’s in order – put in 3 groups• 2) Median x & y (ordered pairs)• 3) Equation of 2 outside pts• 4) Plug middle x in equation• 5) 1/3 ( Actual – Expected )

Let’s try this one…

(8, 98), (9, 83), (11, 95),

(12, 42), (13, 89), (13, 92)

(14, 77), (15, 72), (17, 81),

THREE GROUPSFIND MEDIAN X & Y

GROUP 1: (8, 98), (9, 83), (11, 95) x-values: 8…9…11 y-values: 83…95…98 GROUP 2: (12, 42), (13, 89), (13, 92) x-values: 12…13…13 y-values: 42…89…92GROUP 3: (14, 77), (15, 72), (17, 81) x-values: 14…15…17 y-values: 72…77…81

Write the equation…

(9, 95) and (15, 77)

Plug middle x in…

(13, 89)

1/3 (Actual – Expected)

From 7.2…

• Equation in Vertex Form• ( h , k )

• Equation in X-Intercepts Form• P and Q

Find “A” then write the equation in the correct form (Vertex or Intercept)

Practice Problems…

• p. 248 #’s 1, 2• p. 249 # 4• p. 258 #’s 1, 2, 5, 6

• Turn in these 7 problems at the end of class for a grade!