Calculate the upper and lower limit for a 95% confidence interval about this mean. A family needs a new car, but isn't sure they can fit the payment into their budget. A sample of 36 months of grocery bills yields a mean of $94 with a standard deviation of $10. If the upper limit of a 95% confidence level is below $100, the family can afford to buy the car. Standard error = (standard deviation)/(square root of sample size) Upper limit (dollars and cents) Lower limit (dollars and cents)