Creed wanted to know if there was a correlation between number of years of education and income. He collected data and created t
he scatterplot shown:
Determine the closest correlation coefficient (r value) for this data.
Determine the closest correlation coefficient (r value) for this data.
1 answer:
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Answer:
Step-by-step explanation:
The quadratic formula is:
The discriminant of a quadratic is just the expression under the square root, or . This can tell us the number of solutions a quadratic has.
If the discriminant is:
- Positive = 2 real solutions
- Equal to Zero = 1 real double/repeated solution
- Negative = 0 real solutions, but 2 imaginary solutions
Our quadratic equation has a discriminant of 5, which is positive. Therefore, it has 2 real solutions.