A supervisor is reviewing a production line that has been experiencing problems with the sequencing of tasks. The problem is that gridlocks are occurring because of the inconsistency of sequential operations. He decides to conduct a test wherein two different techniques are used to nish the same task. He measures the times (in minutes). From the sample data he calculated some relevant information given below: Standard Sample -_----I --_----I A 20.3 16.93 65 10 208 6908 Technique B 14.5556 5.5927 131 2157 a) Can the supervisor conclude that technique A is less consistent than technique B? Use 915% condence. b) Estimate the variability of technique B with 95% condence. c) (Fill in the blanks) A random sample of size n is drawn from a population that is normally distributed whose standard deviation is 0' . In hypothesis testing for the population mean, the t test should be used instead of the 2 test if n is greater than and a is