hypothesis
DESCRIPTION
HP809TRANSCRIPT
![Page 1: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/1.jpg)
Hypothesis
A hypothesis is a statement that predicts the relationship between variables
![Page 2: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/2.jpg)
Null Hypothesis
The null hypothesis is a statement that there is no difference or no relationship between
variables.
![Page 3: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/3.jpg)
This is a
null hypothesis.
It states that the mean from group one is equal to the mean from group two.
![Page 4: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/4.jpg)
Alternate Hypothesis
The Alternate hypothesis is a statement that there is difference between variables.
![Page 5: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/5.jpg)
This is a
alternate hypothesis.
It states that the mean from group one is not equal to the mean from group two.
![Page 6: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/6.jpg)
The statement “… that the mean from group one is not
equal to the mean from group two”
signifies the alternate hypothosis is
non-directional.
![Page 7: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/7.jpg)
That means the mean of group 1 can be greater than the mean of group 2, or the mean of group 1 can be less than the mean of group2.
This is a non-directional test.
A non-directional test is also called a
two-tailed test.
![Page 8: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/8.jpg)
Sometimes we want to test a hypothesis in one direction or another.
These tests use a directional test.
A directional test is also called a
one-tailed test.
![Page 9: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/9.jpg)
•Mathematically, a non-directional alternate hypothesis which would use a one-tailed would be look like this:
![Page 10: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/10.jpg)
This statement says the mean of group 1 is greater than the mean of group 2.
![Page 11: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/11.jpg)
This statement says the mean of group 1 is less than the mean of group 2.
![Page 12: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/12.jpg)
Examples of alternate hypothesis which would use a one-tailed test.
Men are taller than women.
Blondes have more fun.
Women are more prone to osteoporosis than men.
![Page 13: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/13.jpg)
Examples of alternate hypothesis which would use a two-tailed test.There is a difference in height between men and
women.
There is a difference in the amount of fun blondes have compared to brunettes and redheads (for both men and women).
There is a difference in the incidence in osteoporosis between men and women.
![Page 14: Hypothesis](https://reader036.vdocuments.us/reader036/viewer/2022082804/54b553bb4a7959b92c8b46a6/html5/thumbnails/14.jpg)