In following question find the critical values x21- /2 and x2/2 for the given level of confidence

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In following question find the critical values x21- α/2 and x2α/2 for the given level of confidence and sample size.
1. 90% confidence, n = 20
2. 95% confidence, n = 25
3. 98% confidence, n = 23
4. 99% confidence, n = 14
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