how do we calculate a confidence interval why do we need interval how to find confidence intervals in statistics how can you find a confidence interval how to find a confidence interval how does a confidence interval work how is the confidence interval calculated how to calculate confidence interval how to find confidence interval how to find the interval of a good confidence interval what is the confidence interval for a soft drink how to find confidence interval for soft drink sample size which information is used when we determine the confidence interval? how do i find the confidence interval what is the confidence interval for soft drink how is confidence interval used how to find an interval of confidence how to find the confidence interval how to find a confidence interval quizlet how to determine the confidence interval of a sample