Means: Confidence Intervals and Sample Size Determination Access tech supplements, videos, and data sets at www.TriolaStats.com TECH CENTER continued Confidence Interval 1. Press K, then select TESTS in the top menu. 2. Select TInterval from the menu if s is not known. (Choose ZInterval if s is known.) 3. Using Summary Statistics: Select stats, press [, and enter the values for sample mean x, sample standard deviation Sx, and sample size n. Using Sample Data: Select Data, press [, and enter the name of the list containing the sample data. Freq should be set to 1. 4. Enter the desired confidence level, C-Level. 5. Select Calculate and press [. Sample Size Determination Not available. TI-83, 84 Plus Calculator Confidence Interval XLSTAT Add-In (Required) Requires original sample data, does not work with summary data. 1. Click on the XLSTAT tab in the Ribbon and then click Parametric tests. 2. Select One-sample t-test and z-test from the dropdown menu. 3. Under Data enter the range of cells containing the sample data. For Data format select One sample. If the first row of data contains a label, also check the Column labels box. 4. Select Student’s t test. 5. Click the Options tab. 6. Under Alternative hypothesis select 3 Theoretical mean. Enter 0 for Theoretical mean and enter the desired significance level (enter 5 for 95% confidence interval). 7. Click OK to display the result under “confidence interval on the mean.” Sample Size Determination Not available. Excel 340 CHAPTER 7 Estimating Parameters and Determining Sample Sizes Confidence Interval 1. Click Stat in the top menu. 2. Select T Stats in the dropdown menu, then select One Sample from the submenu. 3. Using Summary Statistics: Select With Summary from the submenu and enter the sample mean, sample standard deviation, and sample size. Using Sample Data: Select With Data from the submenu and select the desired data column(s). 4. Select Confidence interval for μ and enter the desired confidence level. 5. Click Compute! Sample Size Determination Not available. StatCrunch Confidence Interval 1. Click Stat in the top menu. 2. Select Basic Statistics from the dropdown menu and select 1-Sample t from the submenu. 3. Using Summary Statistics: Select Summarized data from the dropdown menu and enter the sample size, sample mean, and standard deviation. Using Sample Data: Select One or more samples, each in a column from the dropdown menu and select the desired data column(s). 4. Confirm Perform hypothesis test is not checked. 5. Click the Options button and enter the confidence level. For Alternative Hypothesis select 3. 6. Click OK twice. Sample Size Determination 1. Click Stat in the top menu. 2. Select Power and Sample Size from the dropdown menu and select Sample Size for Estimation from the submenu. 3. For Parameter select Mean (Normal) and enter the standard deviation. 4. Select Estimate sample sizes from the dropdown menu and enter the desired margin of error for confidence intervals. 5. Click the Options button to enter the confidence level and select a two-sided confidence interval. 6. Click OK twice. Minitab R command not available at time of publication. R is rapidly evolving, and an updated list of statistical commands is available at TriolaStats.com. R
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