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3. (a) A random sample of n =100 observations was drawn from a normal population. The sample variance was calculated to be s 2 =220.

3. (a) A random sample of n=100 observations was drawn from a normal population. The sample variance was calculated to be s²=220. Test with=0.05 o determine whether we can infer that the population variance differs from 300.

(b) Repeat part (a) changing the sample size to n=50

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