Answer Happy

Online communication. A study suggests that the average college student spends 10 hours per week communicating with others online. You believe that this is an underestimate and decide to collect your own sample for a hypothesis test. You randomly sample 60 students from your dorm and find that on average they spent 13.5 hours a week communicating with others online. A friend of yours, who offers to help you with the hypothesis test, comes up with the following set of hypotheses. Indicate any errors you see. H0​:xˉ<10 hours HA​:xˉ>13.5 hours ​
Age at first marriage, Part II. Exercise 4.16 presents the results of a 2006 - 2010 survey showing that the average age of women at first marriage is 23.44. Suppose a social scientist believes that this value has increased in 2012 , but she would also be interested if she found a decrease. Below is how she set up her hypotheses. Indicate any errors you see. H0​:xˉ=23.44 years old HA​:xˉ>23.44 years old ​