The manufacturer of a certain brand of lightbulbs claims that the variance of the lives of these bulbs is 4200 hours. A consumer agency took a random sample of 25 such bulbs and tested them. The variance of the lives of these bulbs was found to be 5200 hours.
Suppose you must test at 1% level of significance whether the sample result indicates that the variance of such bulbs is more than 4200 hours. What will be the value of test statistic:
30.952.
26.705.
29.714.
All these choices are incorrect.
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