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					T-Tests for Differences in Means, Ratio of Differences Between Annual Percentage Negotiated Wage Change in GM an

The basic variable is the mean Percentage Change in Negotiated Assembler Wage for GM and Ford from September to Septe
Variable 1 = the earlier period, variable 2 = the later period.


t-Test: Paired Two Sample for Means
61-79 and 84-02
                                Variable 1 Variable 2
Mean                             0.018551 0.008489
Variance                         0.000611 0.000246
Observations                            19         19
Pearson Correlation                #N/A
Hypothesized Mean Difference             0
df                                      18
t Stat                           1.287828
P(T<=t) one-tail                 0.107058
t Critical one-tail              1.734063
P(T<=t) two-tail                 0.214117
t Critical two-tail              2.100924

61-76 and 85-00
t-Test: Paired Two Sample for Means
                                Variable 1 Variable 2
Mean                             0.020887 0.004997
Variance                         0.000683 0.00021
Observations                            16         16
Pearson Correlation                 -0.068
Hypothesized Mean Difference             0
df                                      15
t Stat                           2.068465
P(T<=t) one-tail                 0.028145
t Critical one-tail              1.753051
P(T<=t) two-tail                  0.05629
t Critical two-tail              2.131451




61-79 and 80-05
t-Test: Two-Sample Assuming Equal Variances
                              Variable 1 Variable 2
Mean                           0.018551 0.004547
Variance                       0.000611 0.000235
Observations                          19         26
Pooled Variance                0.000392
Hypothesized Mean Difference           0
df                                    43
t Stat                         2.343348
P(T<=t) one-tail               0.011903
t Critical one-tail            1.681071
P(T<=t) two-tail               0.023805
t Critical two-tail            2.016691




61-79 and 82-05
t-Test: Two-Sample Assuming Equal Variances
                              Variable 1 Variable 2
Mean                           0.018551 0.005421
Variance                       0.000611 0.000231
Observations                          19         24
Pooled Variance                0.000397
Hypothesized Mean Difference           0
df                                    41
t Stat                         2.144578
P(T<=t) one-tail               0.018981
t Critical one-tail            1.682879
P(T<=t) two-tail               0.037963
t Critical two-tail            2.019542
Wage Change in GM and Ford Agreements and September to September Inflation Rate

from September to September minus the Annual Inflation Rate, September to September
                                          Difference Between Annual Negotiated Percentage Wage Increases for
                                          Assemblers at GM and Ford, September to September, and Percentage
                                         Change in Urban Wage Earners CPI, September to September, 1961-2005

 0.1




0.08




0.06




0.04




0.02


                                                                                                           y = -0.0003x + 0.018
   0                                                                                                            R² = 0.0433
        61   63   65   67   69    71   73    75   77    79    81    83   85    87    89   91    93    95   97 99 01 03 05



-0.02




-0.04
                                 GM-Ford Deviation from Inflation        Linear (GM-Ford Deviation from Inflation)

				
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posted:8/18/2012
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