Title:
<h2>Life span is the response variable here.</h2>
Step-by-step explanation:
<u>Response variable</u> means the variable which we are trying to measure and explain.
According to the given question, Life span = 3 + 1.3(birth weight).
Here, we are trying to find the life span of a newborn baby.
Hence, in this question, according to the given scenario life span is the response variable.