Teenagers find out to be subject in psychology experiments. When they arrive they are told interviewers were running late . And were left waiting outside. The experimenters Have 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 treatments are being compared. Will the subject open the door? The teenagers agreed to take part in unspecified experiment , And The true nature of the experiment is explain to them afterwards

Does this mean the requirement of informed consent

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.