8 thoughts on “Exam # 3 is on Tuesday, May 6

  1. Sandie Han Post author

    P. 402 #11. Set H0=30, H1 is not equal 30. (This is a two-tail test)
    Test statistic = (32.2-30)/(1.4/sqrt (40))=9.938587. Norm.s.dist(9.938587)=1. P-value=2*(1-1)=2*0=0. Since P-value < alpha, we reject H0.

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    1. Sandie Han Post author

      P. 402 #12. Set H0=16.2, H1 is not equal 16.2. (This is a two-tail test)
      Test statistic = (32-16.2)/(4.7)=3.361702128. Norm.s.dist(3.361702128)=0.9996126818085
      . P-value=2*(1-0.9996126818085)=2*0.0003873181915=0.000774636. If we let alpha=1%. P-value < alpha, we reject H0.

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        1. Sandie Han Post author

          In this case, 32 is possibly the new mean of the population living near a high-level electromagnetic field. Since it is normally distributed, use normal distribution to test the new mean. We are not considering sample mean in this problem. That is why we use s.d. = 4.7

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