Each scatterplot depicts the relationship between two quantitative variables and

Question

Each scatterplot depicts the relationship between two quantitative variables and provides the correlation coefficient, r. Identify whether the statement beside each scatterplot is true or false. Parrot tarsus versus wing length 0.65 Flower stigma height versus anther height r 0.79 16 12 10 e 20 40 80 100 120 10 12 16 Wing length (mm) Anther height (mm) Parrot wing length does not seem to be useful for predicting parrot tarsus length given the form of the scatterplot. For each percentage increase in anther height, it is very likely that the stigma height increases by a proportional percentage Current height versus birth weight (12-year-old boys) Life expectancy versus age (U.S. females) r 0.14 65 E 40 20 ? Scroll 100 Birth weight (oz) 50 150 200 20 40 120 Age (years) Birth weight does not appear to give useful information for predicting current height for 12 year old boys according to the plot. For each percentage increase in age, it is very likely that the life expectancy increases by a proportional percentage.

Explanation / Answer

a) False, r is moderately good. So, it can be useful

b) True

c) True

d) False. Life expectancy decreases as age increases

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