Analyzing Two Variable Data

Which of the following correlation coefficients best correspond with the scatterplot?

• 1

• -0.7

• 0

• -0.1

Which of the following charts is best to illustrate the relationship between 2 quantitative variables?

• segmented bar chart

• histogram

• scatterplot

• pie chart

What is the correlation coefficient of the following set of data:

(1,-3) (2,-6) (3,-9) (4,-12)

Interpret the correlation of r = -0.9

• strong and positive

• strong and negative

• weak and positive

• weak and negative

Bivariate data is the study of how many variables?

• 3

• 1

• 2

• 0

___ data for two variables.

• trivariate

• bivariate

• positive

• negative

The slope of a regression line describes the increase in the response variable when the explanatory variable increases by 1 unit.

• true

• false

A sporting goods chain is planning to open a new store in Fulton County. In order to decide on an optimal location, their market researchers gathered data on sports facilities in towns across the county. The researchers considered the population (in thousands), x, and the number of sports facilities, y, in each town.

The least squares regression line of this data set is: y= 0.292x – 3.886

How many sports facilities does this line predict for a town with 30 thousand people?

Round your answer to the nearest integer.

A sporting goods chain is planning to open a new store in Fulton County. In order to decide on an optimal location, their market researchers gathered data on sports facilities in towns across the county. The researchers considered the population (in thousands), x, and the number of sports facilities, y, in each town.

The least squares regression line of this data set is: y= 0.292x – 3.886

When there are no people in the town, the number of sports facilities is expected to be ________.

Round your answer to the nearest integer.

A sporting goods chain is planning to open a new store in Fulton County. In order to decide on an optimal location, their market researchers gathered data on sports facilities in towns across the county. The researchers considered the population (in thousands), x, and the number of sports facilities, y, in each town. The least squares regression line of this data set is: y= 0.292x – 3.886 For every additional thousand people in the county, the number of sports facilities is expected to increase by [blank]. Round your answer to the nearest integer.