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C02_CIs - Chem 227F 2010 C2 Confidence Limits Due Thursday...

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Chem 227–F 2010 C2: Confidence Limits Due Thursday, September 9 Objective: Solidify your understanding of how Student’s t values and degrees of freedom are used to determine confidence intervals at specific levels of confidence. Also, learn how to use the lookup function in Excel. Data for this assignment are in the file Balance_test.xls ; it contains data from the calibration of a balance and the t-table from the textbook. From the data for the 50-g standard, calculate the mean and standard deviation, then use the function LOOKUP to get t values from the table and calculate the 50%, 90%, 95%, 98%, 99%, 99.5% and 99.9% confidence intervals. Present your results in a table. (Data are also given for a 0.1000 g weight; you do not need to do the same calculations for these data—they are used in question 2 below.) You must do this assignment with the LOOKUP function, but you may find it interesting to compare your results with other functions for calculating confidence intervals.
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