6. Skewed distributions and hypotheses

Question 1

What relationship should the measures of central tendency have in a normal distribution? (Distributions methods 2)

Answer 1

The should all be the same value

Question 2

What does the Kurtosis value show? (Distributions methods 2)

Answer 2

The shape of the normal distribution

Question 3

What does negatively skewed data show? (Distributions methods 2)

Answer 3

mean & median < mode

heightened at the right of the graph

Question 4

What does positively skewed data show? (Distributions methods 2)

Answer 4

mean & median > mode

heightened at the left of the graph

Question 5

How do you find out if data is significantly skewed? (Distributions methods 2)

Answer 5

skewness value ÷ standard error

Question 6

If the data is significantly skewed, what test should be used? (Distributions methods 2)

Answer 6

non-parametric

Question 7

What does a one-tailed hypothesis show? (Distributions methods 2)

Answer 7

Makes a prediction on the direction of the results

Question 8

What does a two-tailed hypothesis show? (Distributions methods 2)

Answer 8

Makes a prediction that there will or will not be a difference, but does not state the direction