Using a quadratic regression equation, it is found that the prediction of the number of songs that Kimberly will download on Month 9 is of:
c. 16.
How to find the equation of quadratic regression using a calculator?
To find the equation, we need to insert the points (x,y) in the calculator.
In this problem, we have that the function initially decreases, then it increases , which means that it is a quadratic function. The points (x,y) to be inserted into the calculator are given as follows:
(1,8), (2,6), (4,5), (6,7), (7,9)
Inserting these points into the calculator, the prediction of y for a value of x is given as follows:
y = 0.391x² - 2.937x + 10.455
Hence, when x = 9, the prediction is:
y = 0.391 x 9² - 2.937 x 9 + 10.455
y = 15.69
Rounded to 16, hence option c is correct.
More can be learned about a quadratic regression equation at https://brainly.com/question/24028025
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