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    Sample Mean for a Normal Population

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    A random sample is selected from a normal population. The population mean is ?=60 and the population standard deviation is ?=15. After a treatment is given to the members of the sample, the sample mean is M=65. The sample size is n=25.
    The hypothesis test:
    H0: ?=60
    H1: ?= <>60
    ?=0.05
    Give reason why or why not the sample mean is sufficient to conclude that the treatment has a significant effect.

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    Statistics confusion
    A random sample is selected from a normal population. The population mean is ?=60 and the population standard deviation is ?=15. After a treatment is given to the members of the sample, the sample mean is M=65. The sample size is n=25.
    The hypothesis test:
    H0: ?=60
    H1: ?= <>60
    ?=0.05
    Give reason why ...

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