We can use a portmanteau test to see whether

A$.$ the set, say, of the first $10$ r$\_$k values, is significantly different from a set in which all $10$ values are less or equal zero.

B$.$ the set, say, of the first $6$ r$\_$k values, is significantly different from a set in which all $6$ values are greater or equal zero.

C$.$ the set, say, of the first $6$ r$\_$k values, is significantly different from a set in which all $6$ values are zero.

D$.$ the set, say, of the first $10$ r$\_$k values, is significantly different from a set in which all $10$ values are greater or equal zero.