## Related questions with answers

The number of vehicles sold in the United States (in millions) for each year is shown in the table below, along with the proportion of those vehicles that were made by General Motors.

$\begin{array}{lcc} \text { Year } & \text { Cars Sold (millions) } & \text { Percent GM } \\ \hline 1950 & 6.0 & 50.2 \\ 1955 & 7.8 & 50.4 \\ 1960 & 7.3 & 44.0 \\ 1965 & 10.3 & 49.9 \\ 1970 & 10.1 & 39.5 \\ 1975 & 10.8 & 43.1 \\ 1980 & 11.5 & 44.0 \end{array}$

$\begin{array}{ccc} \text { Year } & \text { Cars Sold (millions) } & \text { Percent GM } \\ \hline 1985 & 15.4 & 40.1 \\ 1990 & 13.5 & 36.0 \\ 1995 & 15.5 & 31.7 \\ 2000 & 17.4 & 28.6 \\ 2005 & 16.9 & 26.9 \\ 2010 & 11.6 & 19.1 \\ 2015 & 17.5 & 17.6 \end{array}$

To find the answers to the following questions, use a statistical software programme. Is the number of cars sold directly or indirectly related to GM’s percentage of the market? Draw a scatter diagram to show your conclusion.

Solution

VerifiedTo plot a scatter diagram of the data, first, we have to enter it in an empty table like this:

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