Phone navigation The bar graph displays data on the percent of smartphone owners in several age groups who say that they use their phone for turn-by-turn navigation.

(a) Describe what the graph reveals about the relationship between age group and use of smartphones for navigation.

(b) Would it be appropriate to make a pie chart of the data? Explain.

The given bar graph is shown below:

Because the tallest bar in the bar graph corresponds to the category "18-29," the age group most likely to use a smartphone for navigation is 18 to 29 years old.

The 65+ age group has the lowest likelihood of using a smartphone for navigation, as the lowest bar in the bar graph corresponds to the category " 65+ ".

Because each of the bars corresponding to these categories has a height of at least 50, the majority of 18 to 64-year-olds appear to use smartphones for navigating.

Because the bar corresponding to this age category has a height of less than 50, it appears that the majority of people aged 65 and up do not use smartphones for navigating.

According to the bar graph, around 80% of 18-29-year-olds, 72% of 30-49-year-olds, 51% of 50-64-year-olds, and 37% of 65+-year-olds use smartphones for navigation.

If we sum all of these percentages together, we get more than 100 percent, making a pie chart inappropriate.

Furthermore, because the different bars do not reflect a part of the same whole (as each age category is analyzed independently), a pie chart is not appropriate.