Use the following information to construct the confidence intervals specified to estimate . (a) 99% confidence for

Use the following information to construct the confidence intervals specified to estimate µ.
(a) 99% confidence for X̅ = 35, σ = 5.2 and n = 55
(b) 95% confidence for X̅ = 85, σ = 6.3 and n = 35
(c) 90% confidence for X̅ = 6.4, σ = 0.8 and n = 42
(d) 85% confidence for X̅ = 22.3, σ = 2.1, N = 600 and n = 72