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Question 12 IK > BO. Score on last try: 0.67 of 1 pts. See Details for more. > Next question Get a similar question You can retry this question below 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 = 55.9 dollars. You would like to be 95% confident that your estimate is within 2 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 decreases increases If you increases the error bound, the sample size decreases increases