At Armco’s steel plant in Middletown, Ohio, statistical quality-control methods have been used very successfully in controlling slab width on continuous casting units. The company claims that a large...

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Answered Same DayDec 25, 2021

Answer To: At Armco’s steel plant in Middletown, Ohio, statistical quality-control methods have been used very...

David answered on Dec 25 2021
125 Votes
We want to test right tailed hypothesis:
H0 : σ2 ≤ 156 (Null Hypothesis, H0 : σ2 = 156 is also corr
ect)
Ha : σ2 > 156 (Alternative Hypothesis, also called H1)
Given: s2 = 175, n = 31
Significance level, α = 0.05
Degrees of freedom, df = n− 1 = 30
Since this is right tailed test, we need area of α = 0.05 on the right of critical
value. Critical value is given by χ2α = χ20.05 with 30 degrees of freedom. We can
use chi-square table or excel command
CHISQ.INV(1 - 0.05, 30) = 43.772 971 825 7
Critical Value, χ20.05 =...
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