Question 18 (3.5 points) Consider the first four sample autocorrelations of the US inflation rate: corr(t.t+1)=0.84, corr(t,t+2)-0,76; corr(t.t+3)=0.76; corr(t.t+4)=0.67. Select the true statement. The inflation is likely to be serially correlated. The inflation is likely not to be serially correlated. The autocorrelation increases over time. 21 None of the above