def check_t_test(trials_a, trials_b):
    """
    Utility function to check if t test or not.

    Parameters
    ----------
    trials_a : int
        number of successful clicks or successful events.
    trials_b : int
        number of impressions or events.

    Return
    ------
    flag : bool
        True if t test or False    
    """
    return True if trials_a + trials_b < 30 else False