On the basis of her newly developed technique, a student believes she can reduce the amount of time schizophrenics spend in an institution. As director of training at a nearby institution, you agree to let her try her method on 20 schizophrenics, randomly sampled from your institution. The mean duration that schizophrenics stay at your institution is 85 weeks, with a standard deviation of 15 weeks. The scores are normally distributed. The results of the experiment show that the patients treated by the student stay a mean duration of 78 weeks, with a standard deviation of 20 weeks.

What is the alternative hypothesis? [ Select ] ["The newly developed technique will reduce the amount of time schizophrenics spend in an institution", "The newly developed technique will not increase the amount of time schizophrenics spend in an institution", "The newly developed technique will not reduce the amount of time schizophrenics spend in an institution", "The newly developed technique will increase the amount of time schizophrenics spend in an institution"]

What is the null hypothesis? [ Select ] ["The newly developed technique will reduce the amount of time schizophrenics spend in an institution", "The newly developed technique will not reduce the amount of time schizophrenics spend in an institution", "The newly developed technique will increase the amount of time schizophrenics spend in an institution", "The newly developed technique will not increase the amount of time schizophrenics spend in an institution"]

What is your Z_obt? [ Select ] ["-1.355", "2.087", "-2.087", "1.3555"]

What is your Z_crit? [ Select ] ["+1.96 and -1.96", "+1.96", "+1.645", "-1.96", "+1.645 and -1.645", "-1.645"]

Use = 0.05_1tail, what is your decision? [ Select ] ["retain the null hypothesis", "accept the alternative hypothesis", "accept the null hypothesis", "reject the alternative hypothesis", "reject the null hypothesis"]

What is your conclude about the student's technique? [ Select ] ["We conclude that the newly developed technique will not reduce the amount of time schizophrenics spend in an institution", "We conclude that the newly developed technique will increase the amount of time schizophrenics spend in an institution", "We conclude that the newly developed technique will not increase the amount of time schizophrenics spend in an institution", "We conclude that the newly developed technique will reduce the amount of time schizophrenics spend in an institution"]

What is your effect size? [ Select ] ["large", "medium", "Not applicable as we failed to reject the null hypothesis", "small"]