Proportion Difference Test

The 4x5 contingency table has how many cells?

• 9

• 12

• 18

• 20

• 24

The 4x5 contingency table has degrees of freedom of?

• 9

• 12

• 18

• 20

• 24

A study wants to analyze whether or not there are differences in bruxism between men and women. What test will be used?

• Continuity Correction if there is expected count of less than five in more than 20 percent cells

• McNemar if there is no expected count less than five in more than 20 percent cells

• Pearson if there is no expected count less than five in more than 20 percent cells

• Cochrans Q if there is an expected count of less than five in more than 20 percent cells

• Fisher Exact Test if there is expected count of less than five in more than 20 percent cells

In the unpaired comparative test with categorical independent and dependent variables more than 2x2 and there is no expected count of less than 5, nor more than 20% of the number of cells, what test will be used?

• Pearson Chi Square

• Mann Whitney

• McNemar

• Continuity Correction

• Fisher Exact

The parameter of Chi-Square distribution is?

• Number of columns

• Degrees of freedom

• Number of cells

• Number of rows

• None of the options

If for a contingency table df=12 and number of rows is 4 then the number of columns will be?

• 4

• 2

• 3

• 5

• 1

A study is aimed to analyze whether or not there are differences in tooth erosion proportion after fluor application. What test will be used?

• McNemar if there is no expected count less than five in more than 20 percent cells

• Continuity Correction if there is no expected count less than five in more than 20 percent cells

• Cochrans Q if there is no expected count of less than five in more than 20 percent cells

• Fisher Exact Test if there is an expected count less than five in more than 20 percent cells

• McNemar if there are two measurement times

In general, in the x2 test, the greater the difference (O-E) in each cell, then?

• The chance to reject the null hypothesis is getting bigger

• The smaller the value of x2

• The greater the value of x2

• The chance of not rejecting the null hypothesis is getting bigger

• The opportunity not to reject the alternative hypothesis is getting bigger

In the chi-square (x2) test, the null hypothesis is true if?

• The "Observed" frequency is very different from the "Expected" frequency

• "Observed" frequency is higher than "Expected" frequency

• "Observed" frequency is lower than "Expected" frequency

• The "Observed" frequency is approximately the same as the "Expected" frequency

• None of the options

The column total indicates the study design is?

• Cohort

• Survey

• Cross sectional

• Case Control

• All except case control