Question

The liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its effectiveness. Records indicate that the mean shelf life of a 5-gallon jug of chlorine is 2,160 hours (90 days). As an experiment, Holdlonger was added to the chlorine to find whether it would increase the shelf life. A sample of nine jugs of chlorine had these shelf lives (in hours):

2,159	2,170	2,180	2,179	2,160	2,167	2,171	2,181	2,185

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State the null hypothesis and the alternate hypothesis.

State the decision rule for 0.025 significance level. (Round your answer to 3 decimal places.)

Compute the value of the test statistic. (Round your answer to 2 decimal places.)

At the 0.025 level, has Holdlonger increased the shelf life of the chlorine?

Estimate the p-value.

Answer 1