4. When determining nitrates in watermelons by direct potentiometry, the following results were obtained (mcg/g):
0.28; 0.27; 0.25; 0.32; 0.26.
Calculate the mean value and its confidence interval (at P=0.95). Assess the reproducibility of the determination.

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.