Aresearcher who has used evidence collected from a sample of college students to conclude that average hours of sleep per night is related to gpa for all college students has engaged in testing.

Hypothesis Testing

Step-by-step explanation:

According to my research on different experimental designs, I can say that based on the information provided within the question the researcher has engaged in what is known as Hypothesis Testing. This is the process of designing an experiment involving variables to test a certain hypothesis in order to conclude whether it is true of not.

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to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk