Math Problem Statement

Fitting a straight line to a set of data yields the following prediction line: ŷ = 2 + 4x. Complete (a) to (c) below. (a) Interpret the meaning of the Y-intercept, b₀. (b) Interpret the meaning of the slope, b₁. (c) Predict the mean value of Y for X = 2.

Solution

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extracted_textThe image contains a problem related to fitting a straight line to a set of data. The prediction line given is:

y=2+4xy = 2 + 4x

It asks to complete parts (a), (b), and (c) based on this equation. Here's a summary of the problem and the questions:

(a) Interpret the meaning of the Y-intercept, b0=2b_0 = 2:

The Y-intercept is the value of yy when x=0x = 0. Based on the options, you are asked to interpret its significance.

(b) Interpret the meaning of the slope, b1=4b_1 = 4:

The slope indicates the rate of change of yy with respect to xx. Here, you need to understand its meaning based on the options provided.

(c) Predict the mean value of yy for x=2x = 2:

This part asks for a prediction using the equation y=2+4xy = 2 + 4x, specifically for x=2x = 2.


Now, let's proceed by answering each part.

(a) Interpretation of the Y-intercept:

The Y-intercept is 2, which means that when x=0x = 0, the value of yy is 2. The correct interpretation is:

  • Option D: The Y-intercept b0=2b_0 = 2 implies that when x=0x = 0, the mean value of yy is 2.

(b) Interpretation of the slope:

The slope is 4, which means that for every increase of 1 unit in xx, the value of yy increases by 4 units. The correct interpretation is:

  • Option B: The slope b1=4b_1 = 4 implies that for each increase of 1 unit in xx, the value of yy is expected to increase by 4 units.

(c) Prediction for x=2x = 2:

Substitute x=2x = 2 into the equation y=2+4xy = 2 + 4x:

y=2+4(2)=2+8=10y = 2 + 4(2) = 2 + 8 = 10

So, the predicted mean value of yy for x=2x = 2 is 10.


Would you like further details or have any other questions? Here are some related questions to expand on this topic:

  1. What is the general form of the equation for a straight line?
  2. How do you interpret a negative slope in a linear equation?
  3. What is the relationship between the slope and rate of change in real-world applications?
  4. How do you calculate the slope and Y-intercept from a set of data points?
  5. How would you predict yy for a value of x=5x = 5 using the same equation?

Tip: To better understand the slope, try plotting the line on a graph and observe how the value of yy changes as xx increases.

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Math Problem Analysis

Mathematical Concepts

Linear Regression
Slope and Intercept Interpretation
Prediction using Linear Equations

Formulas

ŷ = b₀ + b₁x

Theorems

Slope-Intercept Form

Suitable Grade Level

Grades 9-12