HW 2B: Section 2.3 and 2.4

What is a scatterplot and how does it help​ us?

A scatterplot is a graph of paired​ (x, y) quantitative data. It provides a visual image of the data plotted as​ points, which helps show any patterns in the data. A scatterplot is a graph of paired​ (x, y) quantitative data. It provides a visual image of the data plotted as​ points, which helps to see patterns in the data.

Outliers

Outliers are sample values that lie very far away from the vast majority of the other sample values.

Why is it important to learn about bad​ graphs?

So that we can critically analyze a graph to determine whether it is misleading We should be aware of how easy it is to distort data. Learning about bad graphs teaches us to critically analyze a graph to determine whether it is misleading.

In a​ graph, if one or both axes begin at some value other than​ zero, the differences are exaggerated. This bad graphing method is known as​ _______.

a nonzero axis Using an axis that does not begin at zero can create an incorrect impression that small differences are substantial.

A​ _______ is a graph of each data value plotted as a point.

dotplot A dotplot consists of a graph in which each data value is plotted as a point​ (or dot) along a scale of values. Dots representing equal values are stacked.

​A(n) _______ uses line segments to connect points located directly above class midpoint values.

frequency polygon One type of statistical graph involves the class midpoints. A frequency polygon uses line segments connected to points located directly above class midpoint values.

A​ _______ is a plot of paired data​ (x,y) and is helpful in determining whether there is a relationship between the two variables.

scatterplot A scatterplot​ (or scatter​ diagram) is a plot of paired​ (x,y) quantitative data with a horizontal​ x-axis and a vertical​ y-axis. The horizontal axis is used for the first​ (x) variable, and the vertical axis is used for the second variable. The pattern of the plotted points is often helpful in determining whether there is a relationship between the two variables.