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nataly862011 [7]
3 years ago
6

The Regression Equation Suppose in this semester, our Exam 1 average was about 91 with an SD of about 10.5. Suppose the correlat

ion between our Exam 1 and Exam 2 scores will be similar to what it has been in the past, about 0.75, and finally, suppose our Exam 2 scores will be similar to previous semesters Exam 2 scores with an average of 85 and a SD of 8.2. Use this information
1. What the slope of the regreso equation for predicting our Exam 2 scores from Exam 1 scores Round to 3 decimal places Tries 0/5
2. What the yntercept of the regression ecuation for predicting our team scores from Exam 1 scores found to 3 decimal places Tres 0/5
3. A student got a 96 on our Exam 1 Use the regression equation you just calculated to predict her Exam 2 score (round to the rounds to 29.) rest whole number. For example, 79.5 rounds to 80, n . But 79.49 Tres 0/5
4. Another student got a 65 on Fram 1. What would you predict her Exam 2 score to be? Round your answer to the nearest whole num
5. What is the SD of the prediction errors (same as RMSE) of our regression ecuation Round to 2 decimal places.
Mathematics
1 answer:
Kisachek [45]3 years ago
6 0

Answer:

1. Slope = 0.5857

2. Intercept = 31.7

3. Y = 88

4. X = 70

5. 5.4234

Step-by-step explanation:

We have x and y

Mean of x = 91

Mean of y = 85

Sd of x = Sx = 10.5

Sd of y = Sy = 8.2

The registration regression equation

Y - ybar = r(Sy/Sx)(x-xbar)

y - 85 = 0.75(8.2/10.5)(x-91)

Y - 85 = 0.75(0.7809)(x-91)

Y-85 = 0.5857X - 53.3

Y = 0.5857X - 53.3+85

Y = 0.5857X + 31.7

1. Slope = 0.5857

2. Intercept = 31.7

3. If x = 96,

Y = 0.5857(96) + 31.7

Y = 87.927

Y = 88

4. If x = 65,

Y = 0.5857(65)+31.7

Y = 69.77

Y = 70

5. Sy * √(1-r²)

= 8.2 x √(1-0.75²)

= 8.2 x √(1-0.5625

8.2 x √0.4375

= 8.2x 0.6614

= 5.4234

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yawa3891 [41]

Answer:

The exact interest on $5,870 at 12% is $410.9

Step-by-step explanation:

From the information provided we know that

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When you know the principal amount, the rate, and the time, the amount of interest can be calculated by using the formula:

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We need to convert the 7 months into 1 year.

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Now we can use the above formula

I=P\cdot r\cdot t=5870\cdot 0.12 \cdot \frac{7}{12} \\I = 0.12\cdot \frac{7\cdot \:5870}{12}\\I = 0.12\cdot \frac{20545}{6}\\I = \frac{2465.4}{6}\\I = 410.9

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Answer:

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Answer:

Step-by-step explanation:

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2(x^2-2x)=10

The second rule is to take half the linear term, square it, and add it to both sides.  Our linear term is 2 (from the -2x).  Half of 2 is 1, and 1 squared is 1.  So we add 1 into the parenthesis on the left.  BUT we cannot ignore the 2 sitting out front of the parenthesis.  It is a multiplier.  That means that we didn't just add in a 1, we added in a 2 * 1 = 2.  So we add 2 to the right as well, giving us now:

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Now we move the 12 back over by subtracting and set the quadratic back to equal y:

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Answer:

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thus,

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