a) what is the probability that a sample mean selected from this population would show no change [0] or negative change [less than 0] at 6 months of physical activity? b) what is the probability that a sample mean selected from this population would show no change or a negative change at 12 months of physical activity?
At 6 months of physical activity, mood scores rated on a scale from -5 to 5 after a walking exercise were 3.3 plus or minus 1.2 (mean plus or minus standard error), and at 12 months, mood scores were 3.3 plus or minus 1.3. Assuming these data are
a) what is the probability that a sample mean selected from this population would show no change [0] or negative change [less than 0] at 6 months of physical activity?
b) what is the probability that a sample mean selected from this population would show no change or a negative change at 12 months of physical activity?
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