Identify Hypotheses Part I Write The Null And Alternative Hypotheses In Words And Then Symbols For Each Of The Followi 1 (73.78 KiB) Viewed 26 times
Identify Hypotheses Part I Write The Null And Alternative Hypotheses In Words And Then Symbols For Each Of The Followi 2 (38.65 KiB) Viewed 26 times
Identify hypotheses. Part I. Write the null and alternative hypotheses in words and then symbols for each of the following situations. (a) New York is known as "the city that never sleeps". A random sample of 25 New Yorkers were asked how much sleep they get per night. Do these data provide convincing evidence that New Yorkers on average sleep less thnn 8 hours a night? (b) Employers at a firm are worried about the effect of March Madness, a basketball championship held each spring in the US, on employee productivity. They estimate that on a regular business day employees spend on average 15 minutes of company time checking personal email, making personal phone calls, etc. They also collect data on how much company time employees spend on such non- business activities during March Madness. They want to determine if these data provide convincing evidence that employee productivity decreases during March Madness. a) H∅:μ=8μ=8b) 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 A ge 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 decrense. 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
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 A ge 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
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