The number of marriage licenses issued by Clark County, Nevada, where Las Vegas is located, has been decreasing since the year 2000:

[tex]\[
\begin{tabular}{|r|r|r|r|r|r|r|}
\hline
\text{Year} & 2001 & 2005 & 2008 & 2010 & 2011 & 2014 \\
\hline
\text{Marriage Licenses} & 142,000 & 132,000 & 120,000 & 110,000 & 106,000 & 93,800 \\
\hline
\end{tabular}
\][/tex]

According to the model, how many marriage licenses were issued in 2003? Round your answer to the nearest hundred. You must find the linear regression equation first.

A. 137,000
B. 151,800
C. 127,300
D. 107,200



Answer :

Sure! Let's carefully walk through the steps required to solve this problem using linear regression:

1. Organize the Data:
- We have two sets of data points: years and the corresponding number of marriage licenses issued.
- Years: [tex]\([2001, 2005, 2008, 2010, 2011, 2014]\)[/tex]
- Marriage licenses: [tex]\([142,000, 132,000, 120,000, 110,000, 106,000, 93,800]\)[/tex]

2. Determine the Linear Regression Equation:
- The linear regression equation is of the form [tex]\( y = mx + b \)[/tex], where [tex]\( y \)[/tex] is the number of marriage licenses, [tex]\( x \)[/tex] is the year, [tex]\( m \)[/tex] is the slope of the line, and [tex]\( b \)[/tex] is the y-intercept.

3. Calculate the Parameters of the Model:
- Slope ([tex]\( m \)[/tex]): [tex]\(\approx -3804.99\)[/tex]
- Intercept ([tex]\( b \)[/tex]): [tex]\(\approx 7758358.50\)[/tex]

4. Predict the Number of Marriage Licenses Issued in 2003:
- The year [tex]\( x = 2003 \)[/tex].
- Use the linear regression equation [tex]\( y = mx + b \)[/tex]:
[tex]\[ y = (-3804.99) \times 2003 + 7758358.50 \][/tex]
- Performing the calculation gives us:
[tex]\[ y \approx 136959.13 \][/tex]

5. Round the Result to the Nearest Hundred:
- [tex]\( 136959.13 \)[/tex] rounded to the nearest hundred is [tex]\( 137,000 \)[/tex].

Therefore, the number of marriage licenses issued in 2003, according to the model and rounded to the nearest hundred, is:
[tex]\[ \boxed{137,000} \][/tex]

Hence, the correct answer is: A. 137,000