Answer to Question #190024 in General Chemistry for Caylin Adams

Question

good day

My question is:

In a comparison of two methods for the determination of chromium in rye grass, the following results (mg/kg Cr) were obtained: Method 1: mean = 1.48; standard deviation = 0.28 Method 2: mean = 2.33; standard deviation = 0.31

For each method five determinations were made. Do the two methods give results having means which differ significantly?

Please assist

Answer 1

ie spooled = 0.285

t = 4.07

t > tcrit

With 95% confidence the difference between the two results is significant and the null hypothesis is rejected.