Question: A random sample of size 25 from a normal population has mean 47.5 and standard deviation 8.4. Thus this information tend to support or

A random sample of size 25 from a normal population has mean

A random sample of size 25 from a normal population has mean 47.5 and standard deviation 8.4. Thus this information tend to support or refuse the claim that mean of the population is 42.1 at level of significance 99%.

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