Math Problem Statement

x 1 2 3 4 5 6 y 1044 1492 2408 3516 4742 6853

Use regression to find an exponential equation that best fits the data above. The equation has form y=abx where:

a = Round to two decimal place values.

b = Round to two decimal place values.

Solution

To find the exponential equation that best fits the given data in the form y=abxy = ab^x, we'll use logarithmic transformation and linear regression. This involves taking the natural logarithm of yy values and then performing a linear regression on xx and ln(y)\ln(y).

Step-by-step Process:

  1. Transform the exponential model:

    • Given: y=abxy = ab^x
    • Taking the natural logarithm on both sides: ln(y)=ln(a)+xln(b)\ln(y) = \ln(a) + x \ln(b)
    • This equation resembles a linear form: ln(y)=mx+c\ln(y) = m \cdot x + c, where:
      • m=ln(b)m = \ln(b) (slope)
      • c=ln(a)c = \ln(a) (y-intercept)
  2. Calculate ln(y)\ln(y) for each yy value:

    • x=[1,2,3,4,5,6]x = [1, 2, 3, 4, 5, 6]
    • y=[1044,1492,2408,3516,4742,6853]y = [1044, 1492, 2408, 3516, 4742, 6853]
  3. Perform linear regression on xx and ln(y)\ln(y).

I'll proceed with the calculation to find the values of aa and bb.The exponential equation that best fits the given data is:

y=729.431.46xy = 729.43 \cdot 1.46^x

where:

  • a=729.43a = 729.43 (rounded to two decimal places)
  • b=1.46b = 1.46 (rounded to two decimal places)

Would you like a detailed explanation of the steps, or do you have any other questions?

Here are some related questions:

  1. What is the correlation coefficient (rr) of the regression?
  2. How do we determine if an exponential model is the best fit for the data?
  3. How does transforming data help in regression analysis?
  4. Can you solve for yy when x=7x = 7 using this model?
  5. How would the process differ for a logarithmic or linear model?

Tip: Exponential models are suitable when the rate of change of a variable increases or decreases proportionally to its current value.

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Math Problem Analysis

Mathematical Concepts

Exponential Regression
Linear Transformation
Logarithms
Regression Analysis

Formulas

Exponential equation: y = ab^x
Logarithmic transformation: ln(y) = ln(a) + x ln(b)

Theorems

Linear Regression Theorem
Logarithmic Properties

Suitable Grade Level

Grades 10-12, College level