Reliability of Differences Between Correlated Means (Nᡖ)

• When we look up Z=2.76, we find:

  • P=.0029 --ɭ tailed
  • P=.0058--> 2 tailed
    • to get 2 tailed value we double 1 tailed value.
    • This is true since z is a 1 tailed table.
      • We use additive theorem.

• Value of z required for .01 level for 2 tailed test:

  • .01 level ---ɭ tailed
    • 2.32
  • .01 level ---ɮ tailed
    • 2.57

• Spend some time learning how to use the normal curve table.

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