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T Confidence Interval in Excel. The T Confidence Interval Function is categorized under Statistical functions Functions The T Confidence Interval Function is categorized under Statistical functions and calculates the t confidence value that can be used to construct the confidence interval for a population mean, for a supplied probability and sample size. Confidence Interval Excel Formula =CONFIDENCE(alpha,standard_dev,size) The CONFIDENCE function uses the following arguments: Alpha (required argument) – It is the significance level used to compute the confidence level. The significance level is equal to 1– confidence level. So, a significance level of 0.05 is equal to a 95% confidence level. The confidence interval is a range of values. Your sample mean, x, is at the center of this range and the range is x ± CONFIDENCE. For example, if x is the sample mean of delivery times for products ordered through the mail, x ± CONFIDENCE is a range of population means. Microsoft Excel, a spreadsheet computer program, offers a formula called 'CONFIDENCE' to calculate the confidence interval. The interval represents the range from the survey value in which the true proportion is likely to exist. Confidence interval excel graph. Advanced Excel - Using the IF Function in Excel to Program Your Spreadsheets - Duration: 5:43. Technology for Teachers and Students 143,964 views.

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