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Answer:
b. negative; as time passes, speed decreases
Step-by-step explanation:
Given
[tex](x,y) = \{(5, 15), (10, 13), (15, 11), (20, 10), (25, 9)\}[/tex]
Required
Determine the type of correlation
Split the above values as:
[tex]x \to 5,10,15,20,25[/tex]
[tex]y \to 15,13,11,10,9[/tex]
Notice that as time (x) increases from 5 to 10, and then 15......
Speed (y) value reduces from 15 to 13 .....
The above scenario represents a negative correlation
Hence, (b) is correct.