Mathematics
Mathematics, 16.12.2019 19:31, LikeIke9418

An article in fire technology investigated two different foam-expanding agents that can be used in the nozzles of firefighting spray equipment. a random sample of five observations with an aqueous film-forming foam (afff) had a sample mean expansion of 4.7 and standard deviation of 0.6. a random sample of five observations with alcohol-type concentrates (atc) had a sample mean expansion of 6.9 and a standard deviation of 0.8. you will assume σ 2 1 = σ 2 2 for this problem, so you’ll need to calculate a pooled estimate for σ 2 as s 2 p .

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