stats exam 1: line graphs & scatterplots

line graph

figure that is developed by joining a series of plotted points with a line to illustrate how a variable changes over time

time

what does the X axis document in a line graph

mean score of a variable

what does the Y axis document in a line graph

yes

can a line graph compare more than 1 variable?

illustrates the results from descriptive data analyses and identifies patterns in data over time

what is the purpose of a line graph?

scatterplots

used to describe relationships between 2 variables and to provide representation of data from a study

positive relationship

scatterplot points moving from lower left to upper right show what relationship

negative relationship

scatterplot points moving from upper left to lower right shows what relationship

1 or -1

what is a perfect relationship between 2 varaibles on a scatter plot

pearsons r

what is conducted to determine the strength of the relationship between 2 variables

<0.30 or <-0.30

weak relationship on sactterplot

0.30 to 0.50 OR -0.30 to -0.50

moderate relationship on scatterplot

>0.50 or >0.50

strong relationship on scatterplot

line, strong

if plotted points form a ___ the more ___ the relationship is

outliers

an extreme value in the data set

skew

outliers ______ the data

to identify linear and nonlinear relationships

why might researchers choose to include a scatterplot in the publication of their study