Histograms/boxplots etc

Question 1

What are pie charts used for?

Answer 1

Single variable
Categorical data

Doesn’t show:
Sample size
Actual proportion

Question 2

What are histograms for?

Answer 2

Used with a continuous variable

Shows distribution of data
Chunks data into bins

Question 3

What are boxplots used for?

Answer 3

Continuous variable and also categorical variable

Shows median
See if data is symmetrical
Distribution of data and if it’s similar across groups

Can’t see:
Mean score

Question 4

What are bad charts used for?

Answer 4

Used with continuous DV and at least 1 categorical variable

Shows means for each group
Can see differences between means

Can’t see distribution of data or overlap in variance.

Question 5

When’s a scatterplot used?

Answer 5

With 2 continuous variables

See strength of relationship
Points closer to the line suggests more variance explained by the model

Question 6

How do we predict values?

Answer 6

Y = bx+ a + error

To predict the value of y:

Or y = bx + a

Question 7

What are psychometric scales?

Answer 7

Neither continuous or linear