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# Hypothesis

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### Hypothesis

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