Question

Imagine you have collected data on the temperature and dissolved oxygen (mg/L) in a eutrophic lake over 5 years. You want to see if dissolved oxygen varies with temperature in this lake. What statistical test would you do? Explain why you chose this test.​

Answer 1

The two variables in this case are temperature and oxygen, which would vary with time. In order to see the co-relation between to two test co-relation and regration can be done.

Correlation between two variables is indicated using the correlation coefficient, and its value lies between +1 and -1. And if value of r, is found to be non-zero, it can then be further checked using the student t-test, because the correlation can be due to chance, to reject this possibility, the t-test is performed.

Also, we can also use linear regression to determine a more precise and accurate relationship between the two variables which are temperature and oxygen.

Hope it helps :)