A researcher is interested in the academic performance differences between individuals using an optimistic versus a pessimistic approach to their studies.If the researcher fails to find a significant difference, when in fact one exists in the population:
A) the null hypothesis was correctly accepted.
B) the research hypothesis was correctly accepted.
C) the null hypothesis was correctly rejected.
D) a Type 2 error has been made.
E) a Type 1 error has been made.
Correct Answer:
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