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Buying an existing business

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Concept and Case: Ammar is a seasoned entrepreneur. He is successfully running a fast-food chain franchise. He is planning to buy an existing business (a fast-food franchise of a famous brand). He is eager to opt this new business opportunity amid his previous business experience and expertise. ...

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  • July 23, 2023
  • 3
  • 2022/2023
  • Exam (elaborations)
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Assignment No.2 (Course STA404)
Spring 2023
Name: Seerat Bibi
ID: BC200410215
Submitted to: Prof Javed Iqbal

Question I:


For multiple regression model the simple correlation coefficients are r12 =
0.492, r13 = 0.927, r23 = 0.758. Find the partial correlation coefficient r12.3

Solution:
To find the partial correlation coefficient ( r12.3) between variables 1 (X1) and 2 (X2),
controlling for variable 3 (X3), you can use the following formula:

r12.3 = (r12 - r13 * r23) / √((1 - r13^2) * (1 - r23^2))

Given the simple correlation coefficients:
r12 = 0.492,
r13 = 0.927,
r23 = 0.758,

Let's substitute these values into the formula:

r12.3 = (0.492 - 0.927 × 0.758) ÷ √((1 - 0.927^2) × (1 - 0.758^2))

Simplifying further:

r12.3 = (0.492 - 0.703) ÷ √ ((1 - 0.927^2) × (1 - 0.758^2))
r12.3 = -0.211 ÷ √ (0.007929 × 0.056084)
r12.3 = -0.211 ÷ √ (0.0004446)
r12.3 ≈ -0.211 ÷ 0.021074
r12.3 ≈ -10.01

Therefore, the partial correlation coefficient (r12.3) is approximately -10.01.




Question II:

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