Veterinary Science: Shetland Ponies How much should a healthy Shetland pony weigh? Let x be the age of the pony (in months), and let y be the average weight of the pony (in kilograms). The following information is based on data taken from The Merck Veterinary Manual (a reference used in most veterinary colleges).

(a) Make a scatter diagram and draw the line you think best fi ts the data.

(b) Would you say the correlation is low, moderate, or strong? positive or negative?

(c) Use a calculator to verify that x 5 63, x2 5 1089, y 5 650, y2 5 95,350, and xy 5 9930. Compute r. As x increases from 3 to 24 months, does the value of r imply that y should tend to increase or decrease? Explain.

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x 3 6 12 18 24 y 60 95 140 170 185