Shapes of Distributions

Question 1

When are mean, median and mode identical?

Answer 1

In a normal distribution

Question 2

What is skewness?

Answer 2

It is the extent of how lopsided the frequency curve is rather than symmetrical.

Question 3

What is a positive skew?

Answer 3

There are more scores on the right of the mode than the left.
The mean and median are bigger than the mode.

Question 4

What is a negative skew?

Answer 4

There are more scores on the left of the mode than the right.
The mean and median are smaller than the mode.

Question 5

What is kurtosis?

Answer 5

This is how flat or steep the frequency curve is

Question 6

What are the major features of a distribution?

Answer 6

Central tendency
Variation
Skewness
Kurtosis

Question 7

What are the 3 types of Kurtosis curves?

Answer 7

Leptokurtic - a steep curve
Mesokurtic - a normal curve
Platykurtic - a flat curve (like plateau)

Question 8

What is Bimodal distribution?

Answer 8

It is a continuous probability distribution with two different modes/peaks

Question 9

What is cumulative percent or percentile?

Answer 9

It is where the score will fall within the frequency, relative to all the other scores in the distribution.
Low percentile - low end of distribution
High percentile - high end

Doesn’t matter what shape the distribution is

Question 10

What does a normal distribution looked like?

Answer 10

It is bell-shaped