Changes in the earth's rotation are exceedingly small. However, a very long-term trend could be important. (Reference: Journal of Astronomy , Vol. 57, pp XXXXXXXXXXLet I represent an increase and D a...

Changes in the earth's rotation are exceedingly small. However, a very long-term trend could be important. (Reference:
Journal of Astronomy, Vol. 57, pp. 125-146.) Let I represent an increase and D a decrease in the rate of the earth's rotation. The following sequence represents historical increases and decreases measured every consecutive fifth year.

Test the sequence for randomness. Use ? = 0.05.