Two sets of measurements of ethanol concentration in a sample ofvodka were made using the same instrument, but on two differentdays.
On the first day, a standard deviation of s1= 9 ppm was found,
and on the next day s2 = 2 ppm.
Both datasets comprised 6measurements.
Can the two datasets be combined, or is there is a significantdifference at 95% confidence between the datasets, and should wediscard one of them?
Hint: Begin by defining the null hypothesis,H0: s12 =s22, and the alternate hypothesis,HA: s12 ≠s22.
