example 11.4 in the spacelab life sciences 2 payload, 14 male rats were sent to space. upon their return, the red blood cell mass (ml) of the rats were determined. a control group of 14 male rats was held under the same conditions (except space flight) as the space rats, and their red blood cell mass was also determined when the space rats returned. the project resulted in the data listed in the table below. does the evidence suggest that the flight animals have a different mean red blood cell mass from the control animals at the theta= 0.05 level of significance ?

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