Descriptive Statistics Quiz

Answer each of the following questions (multiple-choice or short-answer) according to the question prompt.

The number that occurs most frequently in a data set is

mean

median

mode

harmonic

What type of graphic presents data in terms of frequencies per category?

Pie chart

Line graph

Bimodal distribution

Histogram

When you are dealing with a normal distribution of scores, which measure of central tendency is preferred?

Mean

Median

Mode

All of the above, as they will be the same in this distribution

The _______ is a single number that represents the total amount of variability in a distribution.

standard deviation

variance

range

mean

Correlation coefficients represent

The degree of relationship between two variables

causality between two relationships

whether the independent variable had an effect

all of the above

Which of the following would probably be negatively correlated?

The number of days in class and exam grade

The height and weight of college students

The number of difficult classes taken and semester GPA

Overall college GPA and graduate school GPA

A perfect positive correlation occurs when

an increase of 1 unit is always accompanied by a proportional increase in the other variable