Essay

Based on the provided example of evaluating a tt score of 1.501.50 with a sample size of 2525, recall how the probability of obtaining a tt score at least this extreme is defined and how the pp-value is calculated when 'extreme' is defined in either direction.

Question: Based on the provided example of evaluating a tt score of 1.501.50 with a sample size of 2525, recall how the probability of obtaining a tt score at least this extreme is defined and how the pp-value is calculated when 'extreme' is defined in either direction.

Sample answer: The probability of a tt score at least this extreme is defined as the proportion of tt scores in the distribution that are at least this extreme. When extreme is defined as being far from zero in either direction, the pp-value is the proportion of tt scores that are 1.501.50 or above or that are 1.50-1.50 or below, which is equal to .14.14.

Key points:

  • Probability is defined as the proportion of tt scores in the distribution that are at least this extreme.
  • Extreme is defined as being far from zero in either direction.
  • The pp-value is the proportion of tt scores that are 1.501.50 or above or 1.50-1.50 or below.
  • The resulting pp-value is .14.14.

Rubric: Students must correctly state that the probability is based on the proportion of tt scores in the distribution that are at least this extreme. They must also recall that the calculation for a two-tailed test sums the proportions of tt scores at or above 1.501.50 and at or below 1.50-1.50, resulting in a pp-value of .14.14.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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