Chapter 4: Describing Data: Displaying and Exploring Data

When you create a dot plot, you do which of these operations?

"Pile up" dots that are too close to show separately. Place a dot along a horizontal scale for each observation.

Which one of these statements is not part of the description of a scatter diagram?

The data points are connected to create a graph.

The interquartile range is a measure of dispersion usually used along with the median. What is the definition of interquartile range?

The distance between the first and third quartile.

Suppose a given data set has the following characteristics: Minimum value: 120 Q1: 160 Q2: 190 Q3: 200 Maximum Value: 220 Which of the following is true about the distribution of the data?

The distribution is negatively skewed.

Which of the following is not a measure of position?

standard deviation

Which of the following are measures of position?

the median the quartiles the deciles

What would the location of the 83rd percentile be for a data set with 40 observations?

34.03

What would the location of the 11th percentile be for a data set with 50 observations?

5.61

Identify the shape of the distribution shown in the picture.

Bimodal

Which of the following statements describe a feature of a scatter diagram

Each paired observation is represented by a single dot One variable is scaled on the horizontal axis and the other is scaled on the vertical axis

Which one of the following pairs of variables would be best-suited for a contingency table?

Favorite Color and Gender

Which of the following are features of a dot plot?

One dot for each observation. A horizontal line indicating the possible values of the data. Dots "piled up" for observations very close together.

Contingency tables are used for summarizing data of what level?

Ordinal Nominal