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Analysis of Calcium Ion Concentration in Water Samples

In an independent laboratory experiment, the concentration of Ca2+ ions in a water sample was determined using two sets of results. Your lab partner recorded values averaging 346 ± 6 ppm, while you reported an average of 338 ± 5 ppm. Statistical analysis using a t-test indicated that the results are not statistically the same at the 95% confidence level (t.calc = 3.31 versus t.table = 2.447). This analysis concludes that neither set of results can be deemed correct based on the statistical discrepancy observed.

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Analysis of Calcium Ion Concentration in Water Samples

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  1. You and your lab partner independently determine the concentration of Ca2+ in a water sample. The results are: YouLab partner 350 ppm 342 ppm 345 ppm 337 ppm 342 ppm 335 ppm 348 ppm 340 ppm Calculate the average and 95% confidence interval for each set of data. Report correctly. you: 346 ± 6ppm partner: 338± 5ppm Are each set of results statistically the same at the 95% confidence level? t calc = 3.31 > t table = 2.447, therefore not statistically the same From this analysis, can you tell who is correct? No

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