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Two sets of measurements of ethanol concentration in a sample of vodka were made using the...

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Chemistry

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.

Answer & Explanation Solved by verified expert
4.0 Ratings (717 Votes)
Using the Ftest to compare two variances or standard deviations When using the Ftest you again require a hypothesis and have to compare standard    See Answer
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