Question

A pond has three species of small fish in the following proportions: minnow (34%), sunfish (18%), guppy (48%). To test whether these fish are predated more or less than expected by random chance, 120 instances of avian predation were observed, and the prey type recorded.

Data: minnow = 27; sunfish = 39; guppy = 54.

The question of interest is: Are the three fish species predately randomly by birds, or is the rate of predation different amongst them?

Step 2: State the null hypothesis.

The rate of predation is the same across the fish species.

Step 3: State the alternative hypothesis.

Step 4: What is the correct level of alpha, and which tails matter? Choose all statements that are correct.

Step 5: Which statistical test are you using?

Step 6: What is the value of the test statistic?

Step 6 continued: How many degrees of freedom in this test?

Step 7: What is the critical value for the test statistic?

Step 8: How does the test statistic compare to the critical value?

Step 9: Based on this comparison, do you accept or reject your null hypothesis?

Step 10: What do you conclude from this analysis?

Answer 1