In a random sample of 100 patients with biopsy-confirmed breast cancer, a study examines cancer detection rates

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In a random sample of 100 patients with biopsy-confirmed breast cancer, a study examines cancer detection rates with 50 previously collected, two-dimensional (2D) mammograms compared to detection rates in 50 previously collected, three dimensional (3D) mammograms. The alpha selected for this pilot study is 0.10, and the power is 0.80.

Knowing the results of the larger study should make the researcher wonder if the conclusion of the smaller pilot study was what type of error?

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