The heat involved in calories per gram of a cement mixture is approximately normally distributed. the mean is thought to be 90 and the standard deviation 2. we wish to test h0: µ = 90 versus µ ≠ 90 with a sample of size n = 10 specimens. (a) if the fail to reject region (ftr) is defined as 88.5 91.5   x find the type i error. (b) find β for the case where the true mean heat has evolved to 93.