(4) STATISTICS

Question 1

What are the 3 types of statistics

Answer 1

Descriptive stats - graphs/tables
Measures of central tendency - mean, median, mode
Measures of dispersion - range & standard deviation

Question 2

What are the pros and cons of a mean

Answer 2

• Mean
○ PROS
§ Takes account of all values
○ CONS
§ Extreme values affect result

Question 3

What are the pros and cons of a mode

Answer 3

• Mode
○ PROS
§ Can use for non-numbers
○ CONS
§ Can be >1 and 0, so not representative

Question 4

What are the pros and cons of the median

Answer 4

• Median
○ PROS
§ Not affected by extreme values
○ CONS
§ Ignores extreme values
□ Not representative

Question 5

What is standard deviation and what does it mean

Answer 5

Standard deviation - how far a value ranges from the mean
High standard deviation - less consistency

Question 6

What are the 3 distributions

Answer 6

Normal, negative and positive

Question 7

What is a normal distribution and what does it look like

Answer 7

Distributions:
• Normal distributions
○ Graph forms bell-curve
○ Most ppl in middle, few extremes
○ Mean median mode all in middle

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Question 8

What are positive and negative distributions and what does they look like

Answer 8

• Skewed distributions
○ Negative distribution
§ Peaks to right
§ Tail skewed to left
○ Positive distribution
§ Peaks to left
§ Tail skewed to right

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