Prob-Stats-1-Section-1-2-HW-Worksheet.pdf

# B do you think these results were obtained using an

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(b) Do you think these results were obtained using an observational study or an experiment? Why? (c) The actual study that produced these results involved 2,761 low-income adults in New York with children aged 1 to 4 years. Who are the individuals in this study? What variable(s) were measured? (1.3) Throw in the Towel! Which paper towel brand absorbs best? Samantha, a 12-year-old, carried out a science project to compare the absorbency of four brands of paper towels Bounty, Scott, Sparkle, and Western Family. She started with four individual sheets of each brand. One at a time, Samantha placed a sheet of paper towel in a container with 200 milliliters of water. After 15 seconds, she removed the paper towel from the water and squeezed out as much water as she could into a graduated cylinder. Samantha then determined the amount of water that had been absorbed. Here are the data she recorded: Bounty 33 31 49 32 Scott 42 34 60 36 Sparkle 53 36 47 33 Western Family 47 26 41 31 (a) Identify two sources of variation in this study.

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