Short Answer

A researcher is conducting a two-tailed test with 2424 degrees of freedom and an alpha level of .05.05, where the critical values are 2.064-2.064 and 2.0642.064. If the computed tt score for their sample is 2.10-2.10, state whether the researcher should reject the null hypothesis and justify this decision using the critical values.

Question: A researcher is conducting a two-tailed test with 2424 degrees of freedom and an alpha level of .05.05, where the critical values are 2.064-2.064 and 2.0642.064. If the computed tt score for their sample is 2.10-2.10, state whether the researcher should reject the null hypothesis and justify this decision using the critical values.

Sample answer: The researcher should reject the null hypothesis. The computed tt score of 2.10-2.10 falls below the lower critical value of 2.064-2.064, placing it in the most extreme 2.5%2.5\% of the lower tail and indicating that the pp-value is less than .05.05.

Key points:

  • The researcher should reject the null hypothesis.
  • The computed tt score of 2.10-2.10 is below the lower critical value of 2.064-2.064.
  • The computed score falls in the extreme lower tail of the distribution.

Rubric: The response must state that the null hypothesis is rejected and justify it by explaining that the computed tt score of 2.10-2.10 falls below the critical value of 2.064-2.064.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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