The bar graph has years in the horizontal axis and demand in the vertical axis.The approximate demand values are as follows: $5700$ in $2008,5550$ in $2009,5500$ in $2010,5500$ in $2011,5800$ in $2012,6050$ in $2013,6300$ in $2014,$ and $6500$ in $2015.$

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$($a$)$ What kind of display is this?

multiple choice $1$

Scatter chart

Line chart

Column chart with $3$D visual effect

Pie chart

$($b$-1)$ Identify an improvement for the graph, using the tips and checklists shown in this chapter.

multiple choice $2$

No improvement is needed.

Show growth rates more clearly.

Zero origin on Y$-$axis would show realistic differences in years.

$($b$-2)$ Would a different type of display be better?

multiple choice $3$

A line chart would work because this is time series data.

A horizontal bar chart would make the differences more apparent.

Use of logarithmic scale would correct proportion issues.