Debrief Chapter 11

Histograms

Use a histogram when

• the number of observations is small.

• you want to look at the distribution of a quantitative variable.

• you want to look at the distribution of a categorical variable.

• you want to show the actual observations.

Histograms

The heights of the bars on a relative frequency histogram displaying the lengths of rivers will add to

• 100%.

• the sample size.

• the sum of all rivers lengths.

• the midpoint of the distribution.

Stemplots

An advantage of a stemplot over a histogram is

• they are good for really large data sets.

• they are horizontal.

• one can recover the actual observation from the display.

• the classes are chosen for you.

Shape of distributions

The figure above contains the scores for 75 students. What is the shape of the exam scores distribution?

• Symmetric.

• Skewed right.

• Skewed left.

• Uniform.

Shape of the distribution

In a certain town, most haircuts are between $10 and $20, but a few salons cater to high-end clients and charge $30 to $60. The distribution of the haircut prices is

• Symmetric.

• Skewed right.

• Skewed left.

• U-shape.