Null hypothesis: μ = 3 pounds per week Alternative hypothesis: μ ≠ 3 pounds per week
SE = s / sqrt(n) = 0.5 / sqrt(15) = 0.1291DF = n - 1 = 15 - 1 = 14 t = (x - μ) / SE = (2.8 - 3)/0.1291 = -1.5491
p = 2.145
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