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

(a) 95%lower bound confidence interval for ???? when ???? = 50, ????̄ = 15.6, and ???? = 2.6.

(b) 99% lower bound confidence interval for ???? when ???? = 61, ????̄ = 68.2, and ???? = 11.6.

(c) 95%upper bound confidence interval for ???? when ???? = 33, ????̄ = 49.8, and ???? = 1.7.

(d) 99%upper bound confidence interval for ???? when ???? = 83, ????̄ = 9.8, and ???? = 0.92.