Listen Some power plants are located near rivers or oceans so that the available water can be used for cooling the condensers. As part of an environmental impact study, suppose a power company wants to estimate the effect on water temperature of the plant discharge. If the sampling technique has a standard deviation of 3.5 C, how many water samples must be taken at each site to estimate the true effect within 0.4 C with 95% confidence? At least 208 water samples At least 295 water samples At least 508 water samples At least 18 water samples At least 217 water samples Question 14 (1 point) Listen