Based on the claim, what should be included in the e-mail to the school principal? check all that apply. claim: cell phones should be allowed in schools because banning them is no longer universally accepted as the best policy. a. cell phones should be allowed in schools because banning them is no longer universally accepted as the best policyb. a counterclaim that supports banning cell phones in schoolc. statistics that show the benefits of having cell phone access in schoolsd. reasons why cell phone access in a classroom can the learning processe. a description of the student body population a counterclaim that supports banning cellf. a rebuttal that rejects the counterclaim

Dr. laguardia is a cognitive neuroscientist who is interested in the effect of brain concussions on the ability to recognize faces. he conducts a quasi-experimental study in which he examines football players before and after the regular season using the benton facial recognition test (a published, widely used measure of one's ability to recognize faces) to compare those who received concussions to those who did not. he finds that players who had concussions during the regular season performed worse on the benton facial recognition test than did players who did not experience which of the following is true regarding external validity in dr.laguardia's study? a. because dr. laguardia selected participants who actually experienced concussions, the study b. because dr. laguardia's study is a quasi-experiment, it is impossible to obtain c. because dr. laguardia's dependent variable was assessed in the laboratory, the study d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.