BMT 7 - Descriptive Statistics

Question 1

Mean

Answer 1

• Another word for average
• Found by adding together two or more numbers and divide by amount of item

Question 2

Mode

Answer 2

the most frequently occurring value from a set of values

Question 3

Median

Answer 3

the middle value in a list of ordered numbers

Question 4

Standard deviation

Answer 4

• the dispersion of data around its mean
• high stdv - data is spread out
• low stdv - data is clustered around mean

Question 5

% between Standard deviation

Answer 5

• about 68% of data falls within one stdv of the mean
• about 95% of data falls within two stdv of the mean
• about 99.7% of data falls within three stdv of the mean

Question 6

Bar Charts

Answer 6

• rectangular bars showing the values represented
• generally used to compare different occurrences of the same event or item

Question 7

Pie Charts

Answer 7

circular graph in which segments of the circle represent percentages of the total

Question 8

Infographics

Answer 8

• graphic representation of information
• used to show research findings or to break down data in a visual way

Question 9

Quartiles

Answer 9

dividing a set of numbers into quarters

• the lowest 25% of income earners
• the second lowest 25% of income earners
• the second highest 25% of income earners
• the highest 25% of income earners

Question 10

Problems with data presentation and interpretation

Answer 10

Should pay attention to:

• The title of the diagram
• Axes and scale
• Year range of data
• Correlation vs causation