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An extra preparation class is advertised to improve the scores. Previous results of 30 students have standard deviation is 2.1 hours which is approximately normally

An extra preparation class is advertised to improve the scores.

Previous results of 30 students have standard deviation is 2.1 hours which is approximately normally distributed.

Assume the standard deviation of the scores is 1.7 hours. Use alpha equal 0.025, test the hypothesis of variance greater than 2.89

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