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77julia77 [94]
3 years ago
6

Mary graphed a line on the graph below. Her friend, Patty, wanted to graph another line

Mathematics
1 answer:
____ [38]3 years ago
4 0

Answer:

answer is c infinitely many your welcome

Step-by-step explanation:

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-2 (x + 4) – (3x – 8)<br> What it equals
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-2x+-8-3x-8

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A college job placement office collected data about students’ GPAs and the salaries they earned in their first jobs after gradua
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X is the GPA

Y is the Salary

Standard deviation of X is 0.4

Standard deviation of Y is 8500

E(X)=2.9

E(Y)=47200

We are given that The correlation between the two variables was r = 0.72

a)y = a+bx

b = \frac{\sum(x_i-\bar{x})(y_i-\bar{y})}{\sum(x_i-\bar{x})^2} = \frac{r \times \sqrt{var(X) \times Var(Y)}}{Var(X)} =  \frac{0.72 \times \sqrt{0.4^2 \times 8500^2}}{0.4^2} = 15300

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So, slope =  15300

Intercept =  2830

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b) Your brother just graduated from that college with a GPA of 3.30. He tells you that based on this model the residual for his pay is -$1880. What salary is he earning?

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c)) What proportion of the variation in salaries is explained by variation in GPA?

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8 0
2 years ago
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