Suppose that a researcher had estimated the first five autocorrelation coefficients using a series of length 100 observations, and found them to be Lag 1 2 3 4 5 Autocorrelation coefficient 0.207 −0.013 0.086 0.005 −0.022 Test each of the individual correlation coefficients for significance, and test all five jointly using the Box–Pierce and Ljung–Box tests.