You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 24.3 dollars....

Extracted text: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 24.3 dollars. You would like to be 99% confident that your estimate is within 10 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? n =