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Analysis of a random sample of 15 specimens of cold-rolled steel to determine yield strengths resulted...

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Statistics

Analysis of a random sample of 15 specimens of cold-rolled steelto determine yield strengths resulted in a sample mean strength of29. 8 and a standard deviation of 4. 0. A second random sample of14 specimens of galvanized steel resulted in a sample mean of 32. 7and a standard deviation of 5. 0. Does the data indicate that thetrue mean yield strengths for the two given populations(cold-rolled or galvanized) are different? Test at a= 0. 01. Makesure to find/estimate the p-value.

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4.4 Ratings (805 Votes)
GivenCold RolledSteel 298 s1 4 n1 15GalvanizedSteel 327 s2 5 n2 14Since s1 s2 4 5 08 between 05 and 2 we use thepooled varianceThe degrees of freedom used n1 n2 2 15 14 2    See Answer
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