; and (ii) feedback from external researchers and other stakeholders. (D) Establish a timeframe for conducting the experiment that shall not exceed 4 years from the award year in which Federal financial aid is first disbursed to students participating in the experiment, at which time the Secretary may opt to extend the experiment for an additional 2 years. (E) Estimate the cost of conducting the experiment. (F) Estimate the necessary sample size of the treatment group of students needed to have statistical significance. (3) Dissemination of information The Secretary shall notify institutions of higher education, through the website of the Department or other means, of the experiments selected by the Secretary under this section and the steps necessary to participate in an experiment. Such notice shall include the information described in subparagraphs (A) through (F) of paragraph (2) for the experiment. (4) Commencement of experiment The Secretary may carry out an experiment, in accordance with the requirements of this section, only if the Secretary has entered into agreements with not less than 5, and not more than 100, institutions of higher education, under which the institutions agree— (A) to participate in the experiment described in the applicable evaluation plan under paragraph (2); (B) to comply with the data collection requirements under subsection (d)(1) and any other reporting requirements determined by the Secretary; and (C) (i) to the methodology for data collection established by the Secretary under paragraph (2)(B) for the experiment