Graphs

Question 1

Bar Chart

Answer 1

Typically used for nominal categorical data. Can be used for ordinal data but the bars must then follow the rank order of the variable categories.

Question 2

Histograms

Answer 2

A type of bar chart with no spaces between the bars as they typically display ordinal (ranked) data or continuous (infinite variable) data. The variables should be organized according to rank.

Question 3

Line graphs

Answer 3

Continuous variables that change over time are frequently best illustrated using this graph. The horizontal axis shows the passage of time, the vertical axis marks the value of the variable over time.

Question 4

Scatterplots

Answer 4

Each point on this graph represents a single response. Good for identifying outliers and trends between variables

Question 5

Probability distribution

Answer 5

graphs the probability of all the possible outcomes instead of their frequency

Question 6

Frequency distribution

Answer 6

graphs the frequency of all the possible outcomes as they occur.

Question 7

Normal distribution

Answer 7

a probability distribution in which the mean, median, and mode are equal (bell curve)

Question 8

Negative skew distribution

Answer 8

an asymmetrical distribution caused by outliers on the left showing a tail moving towards the left side of the graph.

Question 9

Positive skew distribution

Answer 9

an asymmetrical distribution caused by outliers on the right showing a tail moving towards the right side of the graph.

Question 10

What is a Z-score

Answer 10

a standardized measure that tells you how many standard deviations value is from the mean. (used only for normal distributions)