Question: To study the role of population in Belize over the period 1970-1992, Mukherjee et al. estimated the following models:

Model I: \(\ln \left( Po{{p}_{t}} \right)=4.73+0.024t\)

t = (781.25) (54.71)

Model II: \(\ln \left( Po{{p}_{t}} \right)\) = 4.77 + 0.015t - 0.075Dt + 0.011(DtT)

t= (2477.92) (34.01) (-17.03) (25.54)

where Pop=population in millions, t=trend variable, Dt=1 for observations beginning in 1978 and 0 before 1978, and \(\ln \) stands for natural logarithm.

Are the population growth rates statistically different pre- and post- 1978? How do you know? If they are different, what are the growth rates for 1972-1977 and 1978-1992?