Let S and S denote the variances of random samples, of sizes n and m respectively, from two independent distributions which are N(u1,o²) and N(µ2, 0²), respectively. Note that the two populations have different means but the same variances. You may use the fact that has the distribution x with (n + m – 2) df o2 to help you to find a confidence interval for the common unknown variance o?.

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Q: The range of the confidence interval is

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