Proportions: Confidence Intervals and Sample Size Determination Access tech supplements, videos, and data sets at www.TriolaStats.com TECH CENTER continued XLSTAT Add-In (Required) 1. Click on the XLSTAT tab in the Ribbon and then click Parametric tests. 2. Select Tests for one proportion from the dropdown menu. 3. Under Data format select Frequency if you know the number of successes x or select Proportion if you know the sample proportion pn. 4. Enter the frequency or sample proportion, sample size, and 0.5 for Test proportion. 5. Check z test and uncheck Continuity correction. 6. Click the Options tab. 7. Under Alternative hypothesis select 3 D. Enter 0 for Hypothesized difference and enter the desired significance level (enter 5 for 95% confidence interval). Under Variance (confidence interval) select Sample and under Confidence interval select Wald. 8. Click OK to display the result under “confidence interval on the proportion (Wald).” Sample Size Determination Not available. Excel Confidence Interval 1. Press K, then select TESTS in the top menu. 2. Select 1-PropZInt in the menu and press [. 3. Enter the number of successes x, number of observations n, and confidence level (C-Level). 4. Select Calculate and press [. Sample Size Determination Not available. TI-83, 84 Plus Calculator 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 324 CHAPTER 7 Estimating Parameters and Determining Sample Sizes Statistical Literacy and Critical Thinking 1.Poll Results in the Media USA Today provided results from a survey of 1144 Americans who were asked if they approve of Brett Kavanaugh as the choice for Supreme Court justice. 51% of the respondents said that they did approve, and the margin of error was given as plus or minus 3.5 percentage points. What important element of the survey was omitted? 2.Margin of Error For the poll described in Exercise 1, describe what is meant by the statement that “the margin of error was given as {3.5 percentage points.” 7-1 Basic Skills and Concepts Confidence Interval 1. Click Stat in the top menu. 2. Select Proportion Stats from the dropdown menu and select One Sample—With Summary from the submenu. 3. Enter the number of successes and number of observations. 4. Select Confidence interval for p and enter the confidence level. Select the Standard-Wald method. 5. Click Compute! Sample Size Determination Not available. StatCrunch
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