Mathematics, 16.04.2020 20:23 Ashtree519
An article in Fire Technology investigated two different foam expanding agents that can be used in the nozzles of fire-fighting spray equipment. A random sample of five observations with an aqueous film-forming foam (AFFF) had a sample mean of 4.5 and a standard deviation of 0.58. A random sample of five observations with alcohol-type concentrates (ATC) had a sample mean of 7.0 and a standard deviation 0.79. Construct the following: (a) A 90% two-sided confidence interval on sigma Subscript 1 Superscript 2 Baseline divided by sigma Subscript 2 Superscript 2 . (b) A 95% two-sided confidence interval on sigma Subscript 1 Superscript 2 Baseline divided by sigma Subscript 2 Superscript 2 . Comment on the comparison of the width of this interval with the width of the interval in part (a)
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An article in Fire Technology investigated two different foam expanding agents that can be used in t...
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