Data Analysis: Graphs

Question 1

What are the types of ways to present and display quantitative data?

Answer 1

• Tables
• Bar charts
• Histograms
• Line graph
• Scattergram

Question 2

What is a table?

Answer 2

• Raw score displayed in columns and rows

- Summary paragraph underneath to explain results

Question 3

What is a bar chart?

Answer 3

• Categories (discrete data) placed along x-axis and frequency on y-axis
• Height of column represent frequency

Question 4

What is a histogram?

Answer 4

• Bars touch each other
• Continuous data
• True zero

Question 5

What is line graph?

Answer 5

Frequency on one axis, data on another is continuous

-Often shows change

Question 6

What is a scattergram?

Answer 6

• Represent correlation analysis
• Each dot represent one pair of related data
• Axis must both be contentious

Question 7

What are the two types of distributions?

Answer 7

• Normal

- Skewed

Question 8

What are the two different types of skewed distributions?

Answer 8

• Negative skew

- Positive skew

Question 9

What is normal distribution?

Answer 9

• Symmetrical, bell-shaped curve
• Mode, mean and median all occur at the midpoint of the curve
• Most people in the middle

Question 10

What is a skewed distribution ?

Answer 10

Distribution leans to one side or the other because most people are either lower or upper end of distribution

Question 11

Describe a negative skew:

Answer 11

• Most distribution is to the right side of the graph

- Long tail on the left

Question 12

Out of mode, median and mean which has the highest peak in a negative skew?

Answer 12

Mode

Question 13

Out of mode, median and mean which has the lowest peak in a negative skew?

Answer 13

Mean

Question 14

Out of mode, median and mean which has the middle peak in a negative skew?

Answer 14

Median

Question 15

Describe a positive skew:

Answer 15

• Most distribution leans left side of the graph

- Long tail on the right

Question 16

Out of mode, median and mean which has the highest peak in a positive skew?

Answer 16

Mode

Question 17

Out of mode, median and mean which has the lowest peak in a positive skew?

Answer 17

Mean

Question 18

Out of mode, median and mean which has the middle peak in a positive skew?

Answer 18

Median

Question 19

How can you remember whether a skewed distribution is negative or positively skewed?

Answer 19

With your feet

• Negative = left (big toe = mode)
• Positive = right (big toe = mode)