Teenagers signed up to be subjects in a psychology experiment. when they arrive, they are told that interviews are running late, and they are left waiting outside. the experimenters have placed a sign next to the entry door that says, "do not open the door under any circumstances." some subjects are outside alone and others are in pairs; these are the treatments being compared. will the subject open the door? the teenagers agreed to take part in an unspecified experiment, and the true nature of the experiment is explained to them afterward. does this meet the requirement of informed consent? explain. a. no, because they had to wait for the interviews b. no, because they did not know the nature of the experiment before participating c. yes, because they agreed to participate in an experiment d. yes, because they are not forced to open the door e. unable to determine whether subjects consented to experiment

An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution