Benny wants to estimate the mean lifetime of energizer batteries, with a confidence level of 97%, and with a margin of error not exceeding ±10 hours. if the standard deviation of the lifetime is known to be 55 hours, how many batteries does benny need to sample?

Employer informs its employees that it will hold a substantial cash prize drawing for each work group at the end of each month in which no employee in the work group sustains a lost-time injury. tyra reports an injury that she sustained while operating a mechanical power press. tyra did not violate any employer safety rules when she sustained her injury. tyra’s injury requires her to miss work for two days. her employer cancels the cash prize drawing for that month for tyra’s work group because of tyra’s lost-time injury. did the employer misuse an incentive program to retaliate against tyra?