Question

1. which graph is best for understanding the distribution of a single variable?

a. pie chart
b. histogram
c. line graph
d. scatter plot

Explanation:

• A pie chart shows proportions of a whole, not distribution of a single variable.
• A histogram is used to represent the frequency distribution of a single variable by grouping data into bins and showing the frequency (or relative frequency) of each bin, which helps in understanding the distribution (like shape, center, spread) of the variable.
• A line graph is typically used to show trends over time (involving two variables: time and the measured quantity) or relationships between two variables.
• A scatter plot is used to show the relationship between two variables (plotted as points with two coordinates).

Answer:

b. Histogram