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