1)
Let's say that we use 16 mice in a study that seeks a relationship between the concentration (x) of a toxic substance and the mortality time of mice (y), and the findings given in the table below are obtained. Is there a relationship between concentration and death time? What is the direction and strength of the relationship? Find it with correlation analysis.
Concentration (microgram) |
Death time (minutes) |
20 |
20 |
25 |
18 |
30 |
18 |
35 |
16 |
40 |
17 |
45 |
16 |
50 |
15 |
55 |
13 |
60 |
15 |
65 |
14 |
70 |
13 |
75 |
12 |
80 |
9 |
85 |
8 |
90 |
8 |
95 |
7 |
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