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A company determines an employee's starting salary according to the number of years of experience, as detailed in the table.

\begin{tabular}{|l|l|}
\hline Years of experience & Salary \\
\hline 0 & [tex][tex]$\$[/tex]52,000[tex]$[/tex] \\
\hline 1 & [tex]$[/tex]\[tex]$53,150$[/tex][/tex] \\
\hline 2 & [tex][tex]$\$[/tex]54,260[tex]$[/tex] \\
\hline 3 & [tex]$[/tex]\[tex]$55,285$[/tex][/tex] \\
\hline 4 & [tex][tex]$\$[/tex]56,921[tex]$[/tex] \\
\hline 5 & [tex]$[/tex]\[tex]$57,126$[/tex][/tex] \\
\hline
\end{tabular}

Use the equation for the line of best fit to predict the salary for an employee with 6 years of experience. (Round your answer to the nearest dollar.)

A. [tex][tex]$\$[/tex]61,150[tex]$[/tex]
B. [tex]$[/tex]\[tex]$58,587$[/tex][/tex]
C. [tex][tex]$\$[/tex]59,672[tex]$[/tex]
D. [tex]$[/tex]\[tex]$57,990$[/tex][/tex]

Sagot :

To determine the salary for an employee with 6 years of experience using the given data on years of experience and corresponding salaries, we can follow these steps:

1. Model Representation:
We will use a linear model to represent the relationship between years of experience ([tex]\(x\)[/tex]) and salary ([tex]\(y\)[/tex]). This model is of the form:
[tex]\[ y = mx + b \][/tex]
where [tex]\(m\)[/tex] is the slope and [tex]\(b\)[/tex] is the intercept.

2. Finding the Line of Best Fit:
Given the provided data points:
[tex]\[ (0, 52000), (1, 53150), (2, 54260), (3, 55285), (4, 56921), (5, 57126) \][/tex]
we calculated the slope ([tex]\(m\)[/tex]) and the intercept ([tex]\(b\)[/tex]) for the best fit line. The resulting values are:
[tex]\[ m \approx 1084.8 \][/tex]
[tex]\[ b \approx 52078.33 \][/tex]

3. Using the Model to Predict Salary:
To predict the salary for 6 years of experience, substitute [tex]\(x = 6\)[/tex] into the linear model equation:
[tex]\[ y = 1084.8 \times 6 + 52078.33 \][/tex]

4. Calculating the Predicted Salary:
Plugging in the values:
[tex]\[ y \approx 1084.8 \times 6 + 52078.33 \approx 6508.8 + 52078.33 \approx 58587.13 \][/tex]

5. Rounding to the Nearest Dollar:
The predicted salary rounded to the nearest dollar is:
[tex]\[ 58587 \][/tex]

Therefore, the predicted salary for an employee with 6 years of experience is [tex]\(\$58,587\)[/tex].

Among the given answer choices, the correct answer is:
[tex]\[ \boxed{\$58,587} \][/tex]