The following statement is correct: _ _ _ _ _ _ ① Statistics describing trends in a set of data sets include range, variance, standard deviation, etc. Describe the dispersion of a set of data.

① Statistics describing trends in a set of data sets, including average, median and mode. Statistics describing the dispersion degree of a set of data include range, variance, standard deviation, etc. , so ① is incorrect;

② When throwing two coins, the probability of "both heads up" and "both tails up" are 14 respectively, and the probability of "just one coin heads up" is 12, so ② is incorrect;

(3) The lottery is sequential, and the lottery order has no effect on the winning rate, so (3) is correct;

④ Because the basic events are infinite and the possibility that a point falls on any point in a circle is equal, the mathematical model of random test is geometric probability, so ④ is correct.

So the answer is: ③ ④.