اختبار الإحصاء

Which type of study, where data is collected from participants at a single point in time and can be used to ascertain the frequency or prevalence of a disease?

• Case-control study

• Cross-sectional study

• Cohort study

• Experimental study

What is the significance of the logit (y`) in the general formula for logistic regression?

• The constant odds of the outcome

• The predicted log

• Value of predictor variable

• Value representing the slope of the line

Which one of the following is used in survival analysis to plot the proportion of participants who have not experienced the event as a function of time?

• Censored curves

• Incidence Curves

• Risk curves

• Survival curves

How do we calculate the degrees of freedom for the goodness of fit test?

• Number of categories plus one

• (Number of categories)2

• Number of categories minus one

• Number of categories minus two

Which one of the following scales measures the strength of a correlation relationship?

• 1 to 0

• 0 to 1

• 1 to +1

• 1 to 2

What is the graphical representation of data used for correlational designs?

• Boxplot

• Histogram

• Line graph

• Scatterplot

Which one of the following shows us how closely the data points cluster around an imaginary straight line?

• Correlational analysis

• Linear regression analysis

• Logistic regression analysis

• Survival analysis

Which of the following variables is also known as an independent variable in linear regression?

• Continuous variable

• Criterion variable

• Discrete variable

• Explanatory variable

Which of the following formulae is used to calculate the slope of a regression line?

• Ax × Ay

• Ax + Ay

• Du х Ax

• Ay ÷ Ax

Which of the following test is used to assess the association between categorical variables?

• Chi square test

• Correlation test

• Independent sample test

• Z – test