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A random sample ofn= 30 is selected from a normal population with a meanof 50 anda variance of 225. After treatment is administered to the

  1. A random sample ofn= 30 is selected from a normal population with a meanof 50 anda variance of 225. After treatment is administered to the individuals in the sample, the sample mean is found to be 45.
    1. Statethenull hypothesis.(2 mark)
    2. Calculate, using a two-tailed test with= .05, whether the treatment had a statistically significant effect.(8 marks)

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