Pencils and notebooks sell at a much faster rate during the

Pencils and notebooks sell at a much faster rate during the the beginning of the college school year than any other time of the year. Ramen noodles also need to be restocked at record rates at the local grocery store during this time frame. You decide to plot the number of pencils sold against the number of packs of ramen noodles sold, with the results below. Which of the following is a valid conclusion?

Solution

Sales of ramen noodles and pencils are postiviely correlated. When scatter diagram is upward sloping, it shows positive correlation.