Assuming the distribution being sampled is approximately normally distributed, use the small sample confidence interval for the mean to compute a 95% confidence interval for ???? when

(a) ???? = 22, ????̄ = 41.7, and ???? = 7.8.

(b) ???? = 30, ????̄ = 0.08, and ???? = 0.01.

(c) ???? = 25, ????̄ = 119.3, and ???? = 22.7.

Percent 99 Normal Probability Plot 99.9 99.9 95 90 80 70 60 50 40 30 20 10 5 1 0.1 -5.0 -2.5 0.0 Percent 99 95 90 80 70 60 50 40 30 20 10 5 Normal Probability Plot 0.1 2.5 5.0 7.5 25.0 27.5 30.0 32.5 35.0 37.5 40.0 42.5 (a) (b)