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A random sample of size 36 is obtained from a population with variance o2=400, and the sample mean is found to be 87.5. Consider the

A random sample of size 36 is obtained from a population with variance o2=400, and the sample mean is found to be 87.5. Consider the null hypothesis <80 vs. the alternative>80. Test this hypothesis at 4% level. a) reject null hypothesis b) fail to reject the null hypothesis

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