462 CHAPTER 9 Inferences from Two Samples Inferences with Two Means: Independent Samples Access tech supplements, videos, and data sets at www.TriolaStats.com TECH CENTER Statdisk Hypothesis Testing 1. Click Analysis in the top menu. 2. Select Hypothesis Testing from the dropdown menu and Mean Two Independent Samples from the submenu. 3. Select the desired format for Alternative Hypothesis and enter the significance level. For both samples enter the sample statistics, or click the Use Data tab to use columns of data. 4. Under Method of Analysis select Unequal variances: No Pool. 5. Click Evaluate. Confidence Intervals 1. Click Analysis in the top menu. 2. Select Confidence Intervals from the dropdown menu and Mean Two Independent Samples from the submenu. 3. Enter the desired confidence level. For both samples enter the sample statistics, or click the Use Data tab to use columns of data. 4. Under Method of Analysis select Unequal variances: No Pool. 5. Click Evaluate. Minitab 1. Click Stat in the top menu. 2. Select Basic Statistics from the dropdown menu and select 2-sample t from the submenu. 3. Using Summary Statistics: Select Summarized data from the dropdown menu and enter the sample size, sample mean, and sample standard deviation for each sample. Using Sample Data: Select Each sample is in its own column from the dropdown menu and select the desired data columns. 4. Click the Options button and enter the confidence level. Enter 0 for Hypothesized difference and select the desired format for the Alternative hypothesis. 5. Leave Assume equal variances unchecked. Check this box only if you want to assume the populations have equal variances—this is not recommended. 6. Click OK twice. Tip: Another procedure is to click on Assistant in the top menu, select Hypothesis Tests and 2-Sample t. Complete the dialog box to get results, including P-value and other helpful information. StatCrunch 1. Click Stat in the top menu. 2. Select T Stats from the dropdown menu, then select Two 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 for each sample. Using Sample Data: Select With Data from the submenu and select the desired data column for each sample. 4. Leave Pool variances unchecked. Check this box only if you want to assume the populations have equal variances—this is not recommended. 5. Hypothesis Testing: Select Hypothesis test for M1 − M2. For hypothesized difference 1H02 enter 0 and select the desired format for the alternative hypothesis 1HA2. Confidence Intervals: Select Confidence interval for M1 − M2 and enter the confidence level. 6. Click Compute! TI-83, 83 84 Plus Calculator 8 us Ca cu ato Hypothesis Testing: 1. Press K, then select TESTS in the top menu. 2. Select 2-SampTTest in the menu and press [. 3. Select Data if you have sample data in lists or Stats if you have summary statistics. Press [ and enter the list names (leave Freq = 1) or summary statistics. 4. For m1 select the desired format for the alternative hypothesis. 5. For pooled select No. Select Yes only if the population variances are believed to be equal. 6. Select Calculate and press [. Confidence Intervals: 1. Press K, then select TESTS in the top menu. 2. Select 2-SampTInt in the menu and press [. 3. Select Data if you have sample data in lists or Stats if you have summary statistics. Press [ and enter the list names (leave Freq = 1) or summary statistics. 4. For C-Level enter the desired confidence level. 5. For pooled select No. Select Yes only if the population variances are believed to be equal. 6. Select Calculate and press [.
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