A. We are interested in whether snakes at Den B (exposed to humans) have differe

Question

A. We are interested in whether snakes at Den B (exposed to humans) have different mortality rates than rattlesnakes at the more remote den (Den A). Should this be a one-tailed or a two-tailed test?

B. We are interested in whether snakes at Den B (exposed to humans) have different mortality rates than rattlesnakes at the more remote den (Den A). What should our null hypothesis be?

1. Rattlesnakes at Den A show the same survivorship as those at Den B.

2. Rattlesnakes at Den A show greater survivorship than those at Den B.

3. Rattlesnakes at Den B show greater survivorship than those at Den A.

4. Rattlesnake survivorship shows no change from year to year.

Explanation / Answer

Answer to the question :

A. this will be a 2 tailed test. Why? because we are testing just for difference in means, and not for any directional hypothesis. If it were directional hypothesis, then it would have been one tailed.

Answer: 2 tailed test

B.

1 is right. Why? Please see below:

Hypothesis:

Null hypothesis: Ho: MuA-MuB = 0

Alternative hypothesis : MuA-MuB !=0

So, answer is : 1. Rattlesnakes at Den A show the same survivorship as those at Den B.

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