Bivariate Data, SM-Bank 002

People are placed into groups to complete a puzzle. There are 9 different groups.

The table shows the number of people in each group and the amount of time, in minutes, for each group to complete the puzzle.

\begin{array} {|l|c|c|c|c|c|c|c|c|c|}
\hline
\rule{0pt}{2.5ex} \text{Number of people} \rule[-1ex]{0pt}{0pt} & 2 & 2 & 3 & 5 & 5 & 7 & 7 & 7 & 8 \\
\hline
\rule{0pt}{2.5ex} \text{Time taken (min)} \rule[-1ex]{0pt}{0pt} & 28 & 30 & 26 & 19 & 21 & 12 & 13 & 11 & 8 \\
\hline
\end{array}

1. Complete the scatterplot by adding the last four points from the table.  (1 mark)
    
      
2. Add a line of best fit by eye to the graph in part (a).  (1 mark)
   

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3. The graph in part (a) shows the association between the time to complete the puzzle and the number of people in the group.
4. Identify the form (linear or non-linear), the direction and the strength of the association.  (2 marks)
   

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