Snowflake DSA-C02 Exam - Topic 1 Question 46 Discussion

Actual exam question for Snowflake's DSA-C02 exam

Question #: 46
Topic #: 1

In a simple linear regression model (One independent variable), If we change the input variable by 1 unit. How much output variable will change?

Aby 1

Bno change

Cby intercept

Dby its slope

Show Suggested Answer

Suggested Answer: D

What is linear regression?

Linear regression analysis is used to predict the value of a variable based on the value of another variable. The variable you want to predict is called the dependent variable. The variable you are using to predict the other variable's value is called the independent variable.

Linear regression attempts to model the relationship between two variables by fitting a linear equation to observed data. One variable is considered to be an explanatory variable, and the other is considered to be a dependent variable. For example, a modeler might want to relate the weights of individuals to their heights using a linear regression model.

A linear regression line has an equation of the form Y = a + bX, where X is the explanatory variable and Y is the dependent variable. The slope of the line is b, and a is the intercept (the value of y when x = 0).

For linear regression Y=a+bx+error.

If neglect error then Y=a+bx. If x increases by 1, then Y = a+b(x+1) which implies Y=a+bx+b. So Y increases by its slope.

For linear regression Y=a+bx+error. If neglect error then Y=a+bx. If x increases by 1, then Y = a+b(x+1) which implies Y=a+bx+b. So Y increases by its slope.

by Suzan at Jul 31, 2025, 04:58 AM

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Jesusa

8 months ago

By intercept? Nah, that's not how it works!

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Felix

8 months ago

Wait, so it doesn't change by 1? That seems off.

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Josephine

9 months ago

Totally agree, it's all about the slope.

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Laura

9 months ago

Definitely not no change, that's just wrong.

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Dona

9 months ago

It changes by its slope!

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Herminia

9 months ago

I’m pretty confident it’s by its slope, but I hope I’m not mixing it up with another concept!

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Deja

10 months ago

I’m a bit confused; does the intercept play a role here? I thought it was just the slope that mattered.

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Reynalda

10 months ago

I remember practicing a question like this, and I think the answer is related to how steep the line is.

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Lyndia

10 months ago

I think the output changes by the slope of the line, but I'm not completely sure.

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Helene

10 months ago

I'm a bit confused on this one. I know the slope represents the rate of change, but I can't remember if that means the output changes by the slope or by the input. I'll have to review my notes to be sure.

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Henriette

10 months ago

Okay, let me walk through this step-by-step. The question is asking how the output variable changes when we change the input variable by 1 unit. In a simple linear regression, the relationship is described by the equation y = mx + b, where m is the slope. So if x changes by 1 unit, y will change by m units. Therefore, the answer is D.

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Isabelle

11 months ago

Hmm, I'm a bit unsure about this one. I know the slope represents the rate of change, but I can't quite remember if that means the output changes by the slope or by the input. I'll have to think this through carefully.

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Steffanie

11 months ago

This seems straightforward - in a simple linear regression, the change in the output variable is directly proportional to the change in the input variable, so the answer must be D.

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