Chapter 8 Confidence Intervals (Sample Size) Score: 0/12 0/12 answered Question 1 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 - 77.1 dollars. You would like to be 98% confident that your estimate is within 1 dollar(s) of average spending on the birthday parties. How many moms do you have to sample? Do not round mid-calculation. n = Try this with your statistics calculator, if you increases the confidence level, the sample size O decreases O increases If you decreases the error bound, the sample size O increases O decreases Question Help: Message instructor Submit