Suppose a pizza place delivers to the local area at no charge to customers. The owner is interested in estimating the mean tip income for drivers per delivery. Data is collected and the following 99% confidence interval is formed, (1.22, 2.53). Interpret this confidence interval. We are 99% confident that the sample mean tip income for drivers per delivery is between $1.22 and $2.53. We are 99% confident that the population mean tip income for drivers per delivery is between $1.22 and $2.53. We conclude that 99% of the sample is between $1.22 and $2.53. We conclude that 99% of all tips is between $1.22 and $2.53