A confidence interval is desired for the true average stray-load loss u (watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. Assume that stray-load loss is normally distributed with standard deviation = 3.0.
Compute a 95% CI for u when n = 25 and sample mean = 58.3
1) The critical value corresponding to alpha(a)
2) The left end point of the 95% confidence interval for u is
3) The right end point of the 95% confidence interval for u is
4) The 95% confidence interval for u is