In: Math
A)Test the significance of the population correlation coefficient r (t-test using α = 5%)
B)Test the significance of the population regression coefficient b1 (t-test using α = 5%)
C)Interpret the Coefficient of Determination as measure of the goodness of the fit (R2). Data sets are below and Thanks!
Unemployment | Inflation |
4.0 | 3.0 |
4.1 | 4.1 |
4.0 | 5.9 |
3.8 | -0.6 |
4.0 | 1.8 |
4.0 | 5.8 |
4.0 | 2.9 |
4.1 | 0.0 |
3.9 | 5.2 |
3.9 | 1.7 |
3.9 | 1.7 |
3.9 | 2.3 |
4.2 | 5.7 |
4.2 | 2.3 |
4.3 | 0.6 |
4.4 | 1.7 |
4.3 | 5.1 |
4.5 | 2.3 |
4.6 | -1.7 |
4.9 | 0.0 |
5.0 | 4.0 |
5.3 | -2.8 |
5.5 | -0.6 |
5.7 | -0.6 |
5.7 | 1.7 |
5.7 | 1.7 |
5.7 | 3.4 |
5.9 | 3.9 |
5.8 | 0.6 |
5.8 | 1.1 |
5.8 | 2.2 |
5.7 | 2.8 |
5.7 | 1.7 |
5.7 | 2.2 |
5.9 | 1.7 |
6.0 | 1.1 |
5.8 | 3.3 |
5.9 | 5.5 |
5.9 | 4.4 |
6.0 | -4.4 |
6.1 | -0.6 |
6.3 | 1.1 |
6.2 | 2.2 |
6.1 | 3.8 |
6.1 | 2.7 |
6.0 | -0.5 |
5.9 | -1.1 |
5.7 | 2.2 |
5.7 | 4.3 |
5.6 | 3.2 |
5.7 | 4.3 |
5.5 | 1.1 |
5.6 | 5.9 |
5.6 | 3.2 |
5.5 | 0.0 |
5.4 | 1.1 |
5.4 | 1.6 |
5.4 | 5.8 |
5.4 | 2.1 |
5.4 | 0.0 |
5.2 | 1.1 |
5.4 | 3.7 |
5.1 | 5.7 |
5.1 | 4.7 |
5.1 | -0.5 |
5.0 | -0.5 |
5.0 | 6.2 |
4.9 | 5.6 |
5.1 | 12.2 |
4.9 | 2.5 |
5.0 | -6.5 |
4.9 | -0.5 |
Independent variable, X: Unemployment
Dependent variable, Y: Inflation
Following is the output of regression analysis;
SUMMARY OUTPUT | ||||||
Regression Statistics | ||||||
Multiple R | 0.127383261 | |||||
R Square | 0.016226495 | |||||
Adjusted R Square | 0.002172588 | |||||
Standard Error | 2.7536036 | |||||
Observations | 72 | |||||
ANOVA | ||||||
df | SS | MS | F | Significance F | ||
Regression | 1 | 8.75448263 | 8.75448263 | 1.154589606 | 0.286280391 | |
Residual | 70 | 530.7632951 | 7.582332788 | |||
Total | 71 | 539.5177778 | ||||
Coefficients | Standard Error | t Stat | P-value | Lower 95% | Upper 95% | |
Intercept | 4.693261456 | 2.337815171 | 2.007541706 | 0.048553722 | 0.030636179 | 9.355886732 |
Unemployment, X | -0.480458221 | 0.447138234 | -1.074518314 | 0.286280391 | -1.372247297 | 0.411330855 |
A)
Hypotheses are:
The correlation coeffciient is:
r = -0.12738
Degree of freedom: df=n-2=70
Test statistics:
The p-value is: 0.2863
Since p-value is greater than 0.05 so we fail to reject the null hypothesis.
b)
Hypotheses are:
Test statistics:
The p-value is: 0.2863
Since p-value is greater than 0.05 so we fail to reject the null hypothesis.
C)
The R-square is:
R -square = 0.0162
That is 1.62% of variation in dependent variable is explained by independent variable.