Find the Critical Value or Values Of $\chi ^ { 2 }$

question 22

Essay

Find the critical value or values of $\chi ^ { 2 }$ based on the given information.
-A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods
resulted in lengths with a standard deviation of 4.7 cm. At the 0.10 significance level, test the claim that the new
production method has lengths with a standard deviation different from 3.5 cm, which was the standard
deviation for the old method.

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