A professor has been teaching statistics for many years. His records show that the overall mean for nal exam scores is 82,with a standard deviation of 10. The professor believes that this year's class is different than his previous ones. The mean for nal exam scores for this year's class of 65 students is 87. Use = 0.05_2tail.

What is the alternative hypothesis? [ Select ] ["This year's class is not superior to previous classes", "This year's class is superior to previous classes", "This year's class is different than previous classes", "This year's class is not different than previous classes"]

What is the null hypothesis? [ Select ] ["This year's class is not different than previous classes", "This year's class is superior to previous classes", "This year's class is not superior to previous classes", "This year's class is different than previous classes"]

What is your Z_obt? [ Select ] ["0.2432", "-0.2432", "-4.0311", "4.0311"]

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

What is your decision? [ Select ] ["retain the null hypothesis", "accept the alternative hypothesis", "reject the alternative hypothesis", "accept the null hypothesis", "reject the null hypothesis"]

What is your conclude about this years class? [ Select ] ["We conclude that this year's class is different than previous classes", "We conclude that this year's class is not different than previous classes", "We conclude that this year's class is superior to previous classes", "We conclude that this year's class is not superior to previous classes"]

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