A social researcher wants to test the hypothesis that college students may experience different levels of happiness depending on how much they are text messaging. She surveyed students about the frequency of their texting and their happiness. Among 10 heavy texters, she found an average happiness score of 3.8 with a variance of 2.4, whereas the light texters reported an average happiness score of 5.9 with a variance of 2.5.
|
heavy
|
light
|
|
3
|
4
|
|
4
|
6
|
|
5
|
8
|
|
2
|
7
|
|
7
|
5
|
|
4
|
6
|
|
3
|
3
|
|
5
|
6
|
|
2
|
8
|
|
3
|
6
|
What is the null hypothesis? (Pay attention to the scenario.