In a study of the lizard Sceloporus occidentalis, researchers examined field-caught lizards for infection by the malarial parasite Plasmodium. To help assess the ecological impact of malarial infection, the researchers tested 15 infected and 15 non infected lizards for stamina, as indicated by the distance each animal could run in 2 minutes. The distances (meters) are shown in the table.

Do the data provide evidence that the infection is associated with decreased stamina? Investigate this question using
(a) A t test.
(b) A Wilcoxon-Mann-Whitney test.
Let HA be directional and α = 0.05.

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Infected animals 16.4 29.4 28.7 348 37.1 30.2 42.1 23.0 218 24.1 245 203 306 16.4 28.3 32.9 29.1 Uninfected animals 18.4 27.5 45.5 34.0 45.5 24.5 28.7 36.7 22.2 32.9 26.4 37.1 20.3 37.5