A battery manufacturer wants to estimate the average number of
defective (or dead) batteries contained in a box shipped by the
company. Production personnel at this company have recorded the
number of defective batteries found in each of the 2000 boxes
shipped in the past week. Assume that the best estimate of the
population standard deviation () is 0.9 defective batteries per
box.
If the production personnel wants to be approximately 95% sure
that their estimate of the average number of defective batteries
per box is within 0.3 unit of the true mean, the sample size
required to achieve this target is ....?
(please enter an integer, ie: whole number)