Question: A drug company is interested in investigating whether the color of their packaging has any impact on sales. To test this, they used five different colors (blue, green, orange, red, and yellow) for the boxes of an over-the-counter pain reliever, instead of their traditional white box. The following table shows the number of boxes of each color sold during the first month.
Box color Blue Green Orange Red White
Number of boxes sold 310 292 280 216 296
Using the 1% significance level, test the null hypothesis that the number of boxes sold of each of these five colors is the same.