In the Regression Model $Y _ { i } = \beta _ { 0 } + \beta _ { 1 } X _ { i } + \beta _ { 2 } D _ { i } + \beta _ { 3 } \left( X _ { i } \times D _ { i } \right) + u _ { i }$

question 2

Multiple Choice

In the regression model $Y _ { i } = \beta _ { 0 } + \beta _ { 1 } X _ { i } + \beta _ { 2 } D _ { i } + \beta _ { 3 } \left( X _ { i } \times D _ { i } \right) + u _ { i }$ where X is a continuous variable and D is a binary variable, $\beta _ { 3 }$

• A) indicates the slope of the regression when D=1 .
• B) has a standard error that is not normally distributed even in large samples since D is not a normally distributed variable.
• C) indicates the difference in the slopes of the two regressions.
• D) has no meaning since \(\left( X _ { i } \times D _ { i } \right) = 0 \text { when } D _ { i } = 0 \text {. }\)

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Definitions:

5¢->3¢ Direction

The orientation of nucleic acid chains in DNA and RNA synthesis, indicating the direction from the 5' end (phosphate group) to the 3' end (hydroxyl group).

Replication Fork

Y-shaped structure produced during the semiconservative replication of DNA.

Template Strand

The strand of DNA that serves as the guide for synthesizing RNA during transcription, ensuring the correct sequence of nucleotides.

DNA Replication

The biological process of producing two identical replicas of DNA from one original DNA molecule, essential for cell division.