Unit 5 Scatterplots

ordered pair

(x,y)

Gap

An area of a graph that contains no data points

A climber is on a hike. After 2 hours he is at an altitude of 400 feet. After 6 hours, he is at an altitude of 800 feet. What is the altitude when the hiker was starting his hike, hours=0?

0

A climber is on a hike. After 2 hours he is at an altitude of 400 feet. After 6 hours, he is at an altitude of 800 feet. What is the average rate of change?

200 ft/hour

scatterplot

A graphed cluster of dots, each of which represents the values of two variables

Outlier

A value that "lies outside" (is much smaller or larger than) most of the other values in a set of data.

Rate of Change

Change in y/Change in x

negative correlation

Data points that go generally downward from left to right

positive correlation

Data points that go generally upward from left to right

Cluster

When data seems to be "gathered" around a particular value.

line of best fit

a line drawn in a scatter plot to fit most of the dots and shows the relationship between the two sets of data. It is used to make predictions. It is also called a trend line.

dependent variable

a variable whose value depends on the independent variable. the y.

independent variable

a variable whose values are independent of changes in the values of other variables. the x. The value we can choose.

no correlation

there is no relationship between two variables (like your height and the month you were born)