Question

Answer the following questions.

(a) Use the following data to compute a 98% CI for μ₁ − μ₂: m = 45, x = 40,508, s₁ = 2191, n = 45, _y = 41,163, and s₂ = 1884. (Round to the nearest integer.)

Lower limit
Upper limit

Does the resulting interval suggest that μ₁ − μ₂ has been precisely estimated?

The interval is fairly wide, which suggests a precise estimate. The interval is fairly wide, which does not suggest a precise estimate.     The interval is fairly narrow, which suggests a precise estimate. The interval is fairly narrow, which does not suggest a precise estimate.

(b) Use the following data to compute a 98% upper confidence bound for μ₁ − μ₂: m = 44, x = 42,850, s₁ = 2195, n = 44, _y = 36,875, and s₂ = 1570. (Round to the nearest integer.)

Answer 1