Perform the required chi-square hypothesis test. Preliminary data analyses and other information indicate that it isreasonable to assume that the variable under consideration is normally distributed. Use the critical-value approach or theP-value approach as indicated.
-A manufacturer uses a new production method to produce steel rods. Under the old production method, the standard deviation of the lengths of the rods was 3.5 cm. The standard deviation of the lengths of a random sample of 17 steel rods produced under the new method was 2.4 cm. At the 0.10 significance level, test whether the standard deviation of the lengths of the new rods is different from 3.5 cm. Use the critical-value approach.

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The Answer of Perform the required chi-square hypothesis test. Preliminary data analyses and other information indicate that it isreasonable to assume that the variable under consideration is normally distributed. Use the critical-value approach or theP-value approach as indicated.
-A manufacturer uses a new production method to produce steel rods. Under the old production method, the standard deviation of the lengths of the rods was 3.5 cm. The standard deviation of the lengths of a random sample of 17 steel rods produced under the new method was 2.4 cm. At the 0.10 significance level, test whether the standard deviation of the lengths of the new rods is different from 3.5 cm. Use the critical-value approach.

Perform the Required Chi-Square Hypothesis Test