Waiting for answer This question has not been answered yet. You can hire a professional tutor to get the answer.
QUESTION
The population standard deviation for the average life expectancy for a refrigerator part is 3 years.
The population standard deviation for the average life expectancy for a refrigerator part is 3 years. If we want to be 95% confident that the sample life expectancy is within 1 year of the true population mean, how many randomly selected refrigerator parts would we need to examine?
