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An ecology class at community college hypothesized that the fronds of sword fern at local park...

An ecology class at community college hypothesized that the fronds of sword fern at local park grow LONGER in the sun than in the shade. To test this hypothesis they randomly sampled 21 sword ferns growing in the shade and 21 sword ferns growing in the sun, and measured the length of the fronds in the upper section of each fern (cm). Welch's df are 37 and α=0.05. Their results are given below:

x¯ sx n
Sun 142.8 cm 17.3 cm 21
Shade 125.4 cm 22.2 cm 21

What are the requirements (assumptions) for the hypothesis test?

Math   Statistics-And-Probability   
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An ecology class at recently hypothesized that the fronds of sword fern at a local park...
An ecology class at recently hypothesized that the fronds of sword fern at a local park grow LONGER in the sun than in the shade. To test this hypothesis they randomly sampled 21 sword ferns growing in the shade and 21 sword ferns growing in the sun, and measured the length of the fronds in the upper section of each fern (cm). Welch's df are 37 and α=0.05. Their results are given below: x¯ sx n Sun 142.8 cm 17.3...
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