Hemoglobin helps the red blood cells transport oxygen and remove carbon dioxide. Researchers at NASA wanted to

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Hemoglobin helps the red blood cells transport oxygen and remove carbon dioxide. Researchers at NASA wanted to discover the effects of space flight on a rat's hemoglobin. The following data represent the hemoglobin (in grams per deciliter) at lift-off minus 3 days (H-L3) and immediately upon return (H-R0) for 12 randomly selected rats sent to space on the Spacelab Sciences 1 flight. Is the median hemoglobin level at lift-off minus 3 days less than the median hemoglobin level upon return? Use the α = 0.05 level of significance.

H-L3 Rat H-RO Rat H-L3 H-RO 15.2 15.8 14.3 16.4 16.1 16.5 14.5 16.5 3 15.3 16.7 15.2 16.0 4 16.4 15.7 10 16.1 16.8 15.7
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