Graphical Analysis

How do you determine an approximate class width for a frequency distribution?

• Find the range of the data and divide it by the desired number of classes.
• Multiply the range of the data by the desired number of classes.
• Divide the range of the data by the mean of the data.
• Find the median of the data and divide it by the desired number of classes.

What information does a trendline provide in a scatter diagram?

• A trendline provides information about the average of the two variables.
• A trendline provides information about the standard deviation of the two variables.
• A trendline provides information about the maximum value of the two variables.
• A trendline provides information about the relationship between two variables.

What is the IQR (interquartile range) in a box plot?

• Range between Q1 and Q3
• Range between Q3 and Q4
• Range between Q2 and Q3
• Range between Q1 and Q2

Which type of graphical presentation shows both the rank order and shape of a data set simultaneously?

• line graph
• bar graph
• Stem and leaf display

• scatter plot

What does an outlier represent in a box plot?

• A data point that is within the normal range of values in the dataset.
• Data that falls outside the limits of the whiskers

• A data point that is the average of all the other values in the dataset.
• A data point that is missing or not available in the dataset.

What does an ogive represent in summarizing quantitative data?

• A line graph showing the trend of data over time.
• A bar graph representing the frequency of different categories.
• A scatter plot showing the relationship between two variables.
• A graphical representation of cumulative frequency distribution.

What are the three steps necessary to define the classes for a frequency distribution with quantitative data?

• Number of classes, Width of classes, Class limits

• Decide on the class boundaries, Determine the class limits, Calculate the class width
• Identify the class boundaries, Determine the class limits, Calculate the class midpoint
• Choose the class boundaries, Determine the class limits, Calculate the class midpoint