Do students from UF tend to spend less time texting than stu

Do students from UF tend to spend less time texting than students at FSU? A random sample of 100 students was taken from both schools. Let muf be the population mean number of text messages sent per day at UF and let mufsu be the population mean number of text messages sent per day at FSU. How should we write the alternative hypothesis?

A. Ha: mufsu - muf < 0

B. Ha: mufsu - muf > 0

C. Ha: mufsu - muf = 0

D. Ha: mufsu - muf does not equal 0

Solution

We will write the alternative hypothesis as B

ie Ha: mufsu - muf > 0 as we want to test Do students from UF tend to spend less time texting than students at FSU i.e whether mean number of text messages sent per day at UF is less than mean number of text messages sent per day at FSU.