You and your lab partner independently determine the concentration of Ca 2+ in a water sample. The results are: You 350 ppm 345 ppm 342 ppm 348 ppm Lab partner 342 ppm 337 ppm 335 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