Analysis of a random sample consisting of m = 20 specimens of cold-rolled steel to determine yield strengths resulted in
Posted: Thu Apr 28, 2022 7:41 am
Analysis of a random sample consisting of m = 20 specimens of
cold-rolled steel to determine yield strengths resulted in a sample
average strength of π₯ =29.8 ksi. A second random sample of n = 25
two-sided galvanized steel specimens gave a sample average strength
of π¦ =34.7 ksi. Assuming that the two yield-strength distributions
are normal with π1= 4.0 and π2= 5.0
(suggested by a graph in the article βZinc-Coated Sheet Steel: An
Overview,β Automotive Engr., Dec. 1984: 39β43), does the data
indicate that the corresponding true average yield strengths
π1 and π2 are different? Carry out
a test at significance level πΌ= 0.01.
cold-rolled steel to determine yield strengths resulted in a sample
average strength of π₯ =29.8 ksi. A second random sample of n = 25
two-sided galvanized steel specimens gave a sample average strength
of π¦ =34.7 ksi. Assuming that the two yield-strength distributions
are normal with π1= 4.0 and π2= 5.0
(suggested by a graph in the article βZinc-Coated Sheet Steel: An
Overview,β Automotive Engr., Dec. 1984: 39β43), does the data
indicate that the corresponding true average yield strengths
π1 and π2 are different? Carry out
a test at significance level πΌ= 0.01.