Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
What is Hypothesis ?
|
Is a part od statical interferece. Judgementg of Popolation parameter based on sample data.
|
|
how many tests are possible ?
|
1. Single Mean
2. Difference between means 3. Mean differences 4. Single Variance 5. Equality / Inequality of two variances 6. Correlation test (Correlation coefficient) |
|
Formula for Test Stastic ?
|
Test Stastic = (X(mean) - mue(0)) / (smallsigma/n^0.5)
|
|
Type 1 and Type 2 Errors ?
|
Type 1 Error - alpha Error ,when Null Hypothese is true but its been rejected.
Type 2 Error - Beta Error, when Null Hypothesis false but its not been rejected. |
|
CLASS
|
In order to use an object within a program, we need to provide a definition for the object. This definition is called a class. The class describes how the object behaves, what kind of information it contains, and how to create objects of that type. A class can be thought of as a mold, template, or blueprint that the computer uses to create objects.
|
|
What is a P-Value ?
|
Minimum Siginiance Lavel (probability) at which a Null-Hypothesis can be rejected. Example .002718 % (page 253 in book)
|
|
T-test ?
|
with t-statistics example on Iphone
|
|
Test of the Difference of two Polulation means - in how many ways (which type of test )?
|
1. Normally distributed population with unknown variance but assumed equal (t-test)
2. Normally distributed population with unknown variance but assumed unequal (t_test) |
|
Paired Comparision Test ?
|
Paired test is the Test for the difference in the mean for the dependendent Items. (Test for the difference of mean for dividend return for a compney before and after the change of tax policy when tax policy effect the dividend policy)
It is also a T-test. |
|
What is a Chi-squere Test ?
|
A Variance test for a normally distributed population, Chi-squere test dones not have negative values and bounded with zero. (beim Anschu der statistic von tabelle , beacten Probability on the right tail)
|
|
Formula for Chi-squere Test Stastic ?
|
Ho : s = smallsigma(0), Ha : s <> smallsigma(0)
Test statistics : Chi^2 = (n-1)*s^2/smallsigm(0)^2 (where smallsigma(0) --> hypothesis Value) DF = n -1 |
|
Example for Alternative Hypotheis in case of less then or greter then test (picture from Iphone)
|
H(o) : smallsigma^2 >= 16, H(a) : smallsigma^2 < 16
|
|
What is a F-test ? (test statistic formula and degree of freedom)
|
Ho: s1 = s2 , Ha : s1 <> s2
Test for two variance equality test for s1^2/s2^2 =1 (take the highre ration in Zeller s1^2) Degree of Freedon df(1) =n(1)-1 and df(2)=n(2)-1 |
|
What is significance level ?
|
Probability of making Type 1 Error - alpha Error (rejecting the null-hypothesis when is actually true)
|