You measured the concentration of Hcl in a solution by titrations using different indicators to find the end point. Is the difference between indicators 1 and 2 significant at the 95% confidence level?
Indicator 1 is Bromothymol blue of mean Hcl concentration (+/- standard deviation) = 0.09565 +/-0.00225 and # of measurements = 28
Indicator 2 is methyl red of mean Hcl concentration (+/- standard deviation) = 0.08686 +/- 0.00098 and # of measurements = 18