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Excel Guide Chapter 7 Chapter 7 1 5/16/2007 Chapter 7 – Confidence Intervals Excel does not have an automated function to calculate Confidence Intervals. For Confidence Intervals for Mean and Proportions, use MEGASTAT: MEGASTAT Confidence Intervals / Sample Size. Fig 7-1 This input screen has 5 tabs to select the type of computation you need to perform. A. Confidence interval – mean : for the Mean (Both z and t Distributions) B. Confidence interval – p : for Proportions C. Sample size – mean : for the mean D. Sample size – (alpha, beta) : OMIT E. Sample size – p: for Proportions For Confidence Interval for Variance / Standard Deviations use MEGASTAT: MEGASTAT Hypothesis Tests Chi-square variance test
Excel Guide Chapter 7 Chapter 7 2 5/16/2007 A. Confidence Interval – meanExamples Section 7-3: Exercise 6, Page 362: 1. Enter the data into a spreadsheet or find the data set P-C07-S03-6.xls in your data disk and open it. Fig 7-2 2. Calculate the average sales tax (Cell B2) : =Round(Average(A2:A18),1) = 91.1 and the Sample Standard Deviation (Cell C2): =Round(Sdev(A2:A18),3) = 38.366 3. MEGASTAT Confidence Intervals / Sample Size, Click on Confidence Interval - mean, and input the values for Mean, Std. Dev., and n. Choose the “t radio button” (σ not known and n < 30). Then type 98 in the Confidence Level box and click on the Preview button to see the calculated Confidence Interval: 67<μ<115.1 If you press ok, Megastat will place the assumptions and calculated values on a new sheet in the existing workbook, called “Output”
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