(a) Screen these data with a view to performing an ANOVA. Report your results.
(b) Perform `by hand' an ANOVA on the mean lifetimes of the batteries.
(c) Confirm the results of part (b) using SPSS.
(d) Construct a 99% C.I. for the mean lifetime of battery 3.
(e) Construct a 95% C.I. for the difference in mean lifetimes between batteries 1 and 2.