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How much should a healthy Shetland pony weigh? Let xyx: y: be the age of the pony (in months), and let be the average weight of the pony (in kilograms).
3, 6, 12, 15, 24
60, 95, 140, 154, 175
(a) Make a scatter diagram of the data and visualize the line you think best fits the data
(b) Would you say the correlation is low, moderate, or strong?
(c) Use a calculator to verify that Σ(x) = 60, Σ(x2) = 990, Σ(y) = 624, Σ(y2) = 86,566, and Σ(x y) = 8,940.
Compute r
(d) As x increases from 3 to 24 months, does the value of r imply that y should tend to increase or decrease? Explain your answer.
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