The feeding habits of two species of net-casting spiders are studied. These species, the Dinopis and Menneus, coexist in eastern Australia. One variable of interest is the size of the prey of each species. Is there a difference in average prey size between Dinopis and Menneus based on the data below?
| Dinopis prey size (mm) |
| Menneus prey size (mm) | Menneus prey size (mm) |
| 12.9 |
11.9 |
10.2 |
5.3 |
| 10.2 |
17.1 |
6.9 |
7.5 |
| 7.4 |
9.9 |
10.9 |
10.3 |
| 7.0 |
14.4 |
11.0 |
9.2 |
| 10.5 |
11.3 |
10.1 |
8.8 |
Test of equality of variances:
Ho:
Ha:
Test statistic & value:
p-value:
Statistical conclusion:
Test of means:
Ho:
Ha:
Test statistic & value:
p-value:
Statistical conclusion:
Practical conclusion: