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By Erwin Klein

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Number of the first 20 new-hires that you would select for your personal interview study. (g) Save the file as: RAND5 Chapter 3 Confidence Interval About The Mean Using the TINV Function and Hypothesis Testing This chapter focuses on two ideas: (1) finding the 95 % confidence interval about the mean, and (2) hypothesis testing. Let’s talk about the population mean and then about the confidence interval. 1 Confidence Interval About the Mean In statistics, we are often interested in estimating the population mean.

12) Fig. 12 Dialogue Box of Saving an Excel Workbook File as “SALARY3” in Documents: My Documents location Save Important note: Be very careful to save your Excel file spreadsheet every few minutes so that you do not lose your information! 6 Printing a Spreadsheet Objective: To print the spreadsheet Use the following procedure when printing any spreadsheet. File Print Print Active Sheets (see Fig. 13) Fig. 7 Formatting Numbers in Currency Format (2 Decimal Places) 15 Fig. 14 Final Result of Printing an Excel Spreadsheet Before you leave this chapter, let’s practice changing the format of the figures on a spreadsheet with two examples: (1) using two decimal places for figures that are dollar amounts, and (2) using three decimal places for figures.

Now, you need to find the lower limit and the upper limit of the 95 % confidence interval for this study. We will use Excel’s TINV function to do this. We will assume that you want to be 95 % confident of your results. , 19 is n-1). Note that D13 is the mean, while D19 is the standard error of the mean. 99. 41. Now, use number format (two decimal places) in your Excel spreadsheet for the mean, standard deviation, standard error of the mean, and for both the lower limit and the upper limit of your confidence interval.

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