# Quick self quiz interpreting a confidence interval

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Quick Self-Quiz: Interpreting a Confidence IntervalUsing a sample of 24 deliveries described in “Diary of a Pizza Girl” on the Slice website, we find a 95% confidenceinterval for the mean tip given for a pizza delivery to be \$2.18 to \$3.90. Which of the following is a correct interpretation of this interval? Indicate all that are correct interpretations. a). I am 95% sure that all pizza delivery tips will be between \$2.18 and \$3.90.Incorrect. The interval is about the mean, not individual tips..b). 95% of all pizza delivery tips will be between \$2.18 and \$3.90.Incorrect. The interval is about the mean, not individual tips.c). I am 95% sure that the mean pizza delivery tip for this sample will be between \$2.18 and \$3.90.Incorrect. The interval is about the mean of the population, not a sample mean.d). I am 95% sure that the mean tip for all pizza deliveries in this area will be between \$2.18 and \$3.90.Correct!e). I am 95% sure that the confidence interval for the mean pizza delivery tip will be between \$2.18 and \$3.90.Incorrect. The confidence is in where the population mean is, not where the interval itself is.