A marine biologist investigated the respiration rate of the blue mussel, Mytilus edulis, across a range of water temperatures under two different pH conditions: normal pH (8.1) and acidified pH (7.7).
The results of the study are shown in the graph below. Error bars represent ±1 \pm 1\,±1 standard deviation.
The biologist performed a Spearman's rank correlation coefficient test (rsr_srs) to analyze the strength and direction of the relationship between water temperature and respiration rate for both datasets.
Which of the following statements about the correlation and statistical analysis shown on the graph is correct?
The value of rsr_srs for mussels in the normal pH (8.1) group will be between 000 and +1+1+1.
The value of rsr_srs for mussels in the acidified pH (7.7) group will be between −1-1−1 and 000.
There is a positive correlation between water temperature and respiration rate in the normal pH (8.1) group.
The value of rsr_srs for mussels in the acidified pH (7.7) group will be between 000 and +1+1+1.
