Light bulbs of a certain type are advertised as having an averagelifetime of 750 hours. the price of these bulbs is very favorable, so a potential customer has decided to go ahead with a purchasearrangement unless it can be conclusively demonstrated thatthe true average lifetime is smaller than what is advertised. arandom sample of 50 bulbs was selected, the lifetime of each bulbdetermined, and the appropriate hypothesis were tested usingminitab, resulting in the accompanying output.
col1 variable n mean st dev semean zp -value
col2 lifetime 50 738.44 38.20 5.40-2.14 0.016
what conclusion would be appropriate for a significance level of.05 ? .a significance level of .01 ? . what significance level wouldyou recommend ?