A production process is known to produce output with a variance of 4 units 2. Management is concerned that the variance in the production process has changed. Data collected from a random sample of units produced during the production process are shown in the table. Using a 1% level of significance, test if the variance of the output from the production process has changed. Assume the measurements are normally distributed.

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6 12 11 14 11 15 13 13 12 12 14