7. Suppose, hypothetically, that you split the State College annual average temperature time series into two sub-time series - one covering the earlier 1950-1984 period and another covering the latter 1985-2021 period. You calculate the slopes of the linear trend lines corresponding to these sub-time series and the standard errors of those slopes. By adding the corresponding standard error to each slope value and also subtracting it from each slope value, you find the upper and lower bounds, respectively, of the 95% confidence interval for each slope. You find that the two confidence intervals overlap. Given this finding, explain whether or not the slopes are statistically different. Give your discussion on the answer sheet