(a) Predict the mean 28-day strength of concrete whose 7-day strength is 2550 psi.
(b) Construct a 95% confidence interval for the mean 28-day strength of concrete whose 7-day strength is 2550 psi.
(c) Predict the 28-day strength of concrete whose 7-day strength is 2550 psi.
(d) Construct a 95% prediction interval for the 28-day strength of concrete whose 7-day strength is 2550 psi.
(e) Explain the difference between the predictions in parts (a) and (c)..