If the mean is 4.0, the median is 9.5, and the mode is 15.5, how would you describe the distribution in terms of skew (positive, negative, or no skew)?

Imagine a large class where nearly everyone scores between 83-84%, with hardly any dispersion beyond this narrow range (so it would appear to have a very narrow peak). How would you describe this distribution of data in terms of kurtosis?

Identify the specific type of validity addressed in this statement:

Mischel's marshmallow test in young children accurately predicts emotional intelligence later in life.

If you want to read details about the sample and instruments used in a study, (beyond the abstract - think Introduction, Methods, Results, or Discussion)?