Find the critical values x and x for the given level of XU confidence and sample size. Use three decimal places. Hint: If you get the wrong answer, try switching your answers around. a) 90% confidence, n=20; x²= XL XU= b) 99% confidence, n=14; xz= XL xv= c) 95% confidence, n=25; x² = XL 2 XU=

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