In: Economics
Your firm is interested in learning more about how its salaries relate to its employees' tenure with the firm. It has collected the following data for 25 of its employees.Plot these data points, and describe using regression how salary relates to firm tenure for this group. [In response, please provide excel details]
Employee Number | Tenure (Years) | Salary ($) |
1 | 15 | $53,408 |
2 | 32 | $77,230 |
3 | 14 | $53,664 |
4 | 20 | $55,647 |
5 | 25 | $60,611 |
6 | 14 | $51,991 |
7 | 28 | $71,071 |
8 | 30 | $69,189 |
9 | 28 | $67,359 |
10 | 17 | $50,978 |
11 | 14 | $56,176 |
12 | 6 | $38,865 |
13 | 21 | $58,176 |
14 | 11 | $52,101 |
15 | 14 | $50,941 |
16 | 32 | $73,964 |
17 | 29 | $67,873 |
18 | 33 | $73,860 |
19 | 27 | $60,519 |
20 | 16 | $48,474 |
21 | 26 | $69,574 |
22 | 3 | $34,594 |
23 | 14 | $52,176 |
24 | 9 | $56,444 |
25 | 14 | $57,806 |
Tenure is the independent variable and Salary is the dependent variable.
Scatter plot:
Excel Regression output as follows.
SUMMARY OUTPUT | ||||||
Regression Statistics | ||||||
Multiple R | 0.9277 | |||||
R Square | 0.8606 | |||||
Adjusted R Square | 0.8546 | |||||
Standard Error | 4087.9683 | |||||
Observations | 25 | |||||
ANOVA | ||||||
df | SS | MS | F | Significance F | ||
Regression | 1 | 2373544775 | 2373544774.9 | 142.0308 | 2.53542E-11 | |
Residual | 23 | 384364144.9 | 16711484.56 | |||
Total | 24 | 2757908920 | ||||
Coefficients | Standard Error | t Stat | P-value | Lower 95% | Upper 95% | |
Intercept | 36079.0359 | 2051.8878 | 17.5833 | 0.0000 | 31834.3826 | 40323.6892 |
Tenure (Years) | 1139.6648 | 95.6282 | 11.9177 | 0.0000 | 941.8429 | 1337.4868 |
Estimated regression equation: Salary ($) = 36,079.0359 + 1,139.6648 x Tenure (years)
It means that as Tenure increases (decreases) by 1 year, Salary increases (decreases) by $1,139.6648.
Since R2 = 0.8606, it means that this model explains 86.06% of variablity of data and is a good fit.