Question: Use SPSS to enter two trials for the same test on at least 10 people. Calculate the alpha coefficient reliability (intraclass) with the scale procedure.

Use SPSS to enter two trials for the same test on at least 10 people. Calculate the alpha coefficient reliability (intraclass) with the scale procedure. Then use the Spearman-Brown prophecy formula or Spearman-Brown table to estimate what the reliability would be from the previous question if you increased the test length 2, 3, 4, and 5 times.

What is the rationale behind using the Spearman-Brown prophecy formula?

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