Assuming the normality assumption is valid, compute a 95% confidence interval for ????1 when (a) ????1 = 2.3, ????????(????1) = 0.5, and ???? = 40.

Assuming the normality assumption is valid, compute a 95% confidence interval for

????1 when

(a) ˆ????1 = −2.3, ????????(ˆ????1) = 0.5, and ???? = 40.

(b) ˆ????1 = 11.8, ????????(ˆ????1) = 2.72, and ???? = 100.

(c) ˆ????1 = 3.76, ????????(ˆ????1) = 0.98, and ???? = 95.