3. Weddell seals live in the Antarctic and feed on fish during long, deep dives

Question

3. Weddell seals live in the Antarctic and feed on fish during long, deep dives in freezing water. The seals benefit from these feeding dives, but the food they gain comes at a metabolic cost. The dives are strenuous. A set of researchers wanted to know whether feeding was also energetically expensive, over and above the exertion of a regular dive (Williams et al 2004). They determined the metabolic cost of dives by measuring the oxygen use of seals as they surfaced for air after a dive. They measured the metabolic cost of 10 feeding dives and for each of these also measured a non-feeding dive by the same animal that lasted the same amount of time. The data, in (ml O2 kg-1), are as listed in Excel Sheet 3 Is there a difference between the metabolic cost of a feeding dive and the metabolic cost of a nonfeeding dive? (a) What are the hypotheses?

Explanation / Answer

Answer:

For the given scenario, we have to use two sample t test for the population means. The null and alternative hypotheses for this test are given as below:

Null hypothesis: H0: There is no any statistically significant difference between the metabolic cost of a feeding drive and the metabolic cost of a non-feeding drive.

Alternative hypothesis: Ha: There is a statistically significant difference between the metabolic cost of a feeding drive and the metabolic cost of a non-feeding drive.

H0: µ1 = µ2 versus Ha: µ1 µ2

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