Unit 4 Quiz 6-7

Is this a function?

• Yes because 0 has 2 different y-values

• No because 0 has 2 different y-values

• No because the x-values 0 and 2 have the same y-value of 1

• Yes because the x-values 0 and 2 have the same y-value of 1

Is the graph a function?

• Yes. It passes the vertical line test.

• No. It fails the vertical line test.

• Yes. It fails the vertical line test.

• No. It passes the vertical line test.

1. Use the functions

h(x)= -3x-5

to evaluate the value of the expression below.

h(5)

1. Use the functions

g(x)= x+4

to evaluate the value of the expression below.

g(-2)

Find f(1)

Given the equation x -2y =12 , write the equation of the line that is perpendicular to the equation and passes through the points (1, -3) .

Write your answer in point-slope form.

Mathematical Equivalence

ON

Find the correlation coefficient of the data.

• r=.0003

• r=.0184

• r=.0108

• r=.4395

Which correlation coefficient best represents the scatterplot?

• r = -0.98

• r = 0.02

• r = 0.83

• r = -0.65

• r = 0.42

Given the following ordered pairs

(3,7), (4,9), (5,11), (6,13), (7,15),

write the line of best fit for this scatterplot.

Mathematical Equivalence

ON

The scatter plot shows the relationship between practice hours and points scored.

The equation for the line of best fit is y=1.1x+1. 

What is the meaning of 1.1 in the equation?

• For every additional hour of practice, 1.1 more average points are scored.

• For every additional 1.1 points that are scored, 1.1 more hours were spent practicing.

• The correlation is 1.1

• For every additional 1.1 hours spent practicing the score decreases by 1 point.