You’ve conducted a study to determine how the number of calories a person consumes in a day correlates with time spent in vigorous bicycling. Your sample consisted of ten women cyclists, all of approximately the same height and weight. Over a period of two weeks, you asked each woman to record the amount of time she spent cycling each day and what she ate on each of those days. You used the eating records to calculate the calories consumed each day. Figure 10 shows a scatterplot with each woman’s mean time spent cycling on the horizontal axis and mean caloric intake on the vertical axis. Do higher cycling times correspond to higher intake of calories?

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Calories per day 3,500 3,000 2,500 2,000 1,500 1,000 500 00 0.5 1.0 1.5 2.0 2.5 Cycling per day (hours) 3.0 3.5 Figure 10