An environmental psychologist investigated ways to reduce waste. He randomly assigned office workers in small businesses to three groups:

(1) To be in a control group,

(2) To receive daily e-mail reminders about the importance of recycling, or

(3) To have their current wastebaskets replaced with much smaller wastebaskets. To make sure they didn€™t influence each other, each worker was selected from a different small business. At the end of the week, the psychologist measured how many pounds of office waste each person had generated. Here are the data:

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Daily Control e-mail Smaller Group Reminders Wastebaskets 12 14 14 12 4 18 10 8. 12 Meni =11.00 M= 14.00 M= 12.00 M= 6.00 Grand S= 2.00 S= 2.00 S= 2.83