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Worksheetsاختبار الإحصاء
Total questions: 37
Worksheet time: 26mins
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
Which one of the following studies is the gold standard in identifying causality?
Case-control study
Cross-sectional study
Ecological study
Experimental study
Which one of the following refers to Type I error?
reject the null hypothesis when it is in fact false
reject the alternate hypothesis when it is in fact true.
reject the null hypothesis when it is in fact true.
reject the alternate hypothesis when it is in fact false
Which of the following is the non -parametric equivalent of the t-test for the independent groups?
Cohen's d test
Homogeneity test
Mann Whitney test
Wilcoxon test
Which of the following refers to the size and strength of difference between two or more groups or conditions?
Confidence interval
Effect size
Probability
Statistical power
Which of the following tests is an extension of the Mann Whitney test and used for three or more groups?
Kruskal Wallis
Friedman's test
Wilcoxon test
Bootstrapping test
Which one of the following tests is less powerful as compared to the Kruskal-Wallis test?
Mean test
Median test
Variability test
Z-test
What are the considerations taken into account in the formula for adjusted-R2?
Number of outliers and sample size
Number of variables and outliers
Number of variables and sample size
Number of variables and size effect
Which of the following shows how the data points are closely fit to the straight line?
Categorical regression
Correlation analysis
Line of best fit
Predictor line
What does the literature review mean?
Collect data from the field
Design research tools
Make final decision about research
Searching previously published research
Which of the following defines the inter-quartile range?
The third quartile divided by the first quartile
The third quartile minus the first quartile
The third quartile multiply by the first quartile
The third quartile plus the first quartile
What is the general formula for simple logistic regression model?
logit (y) = a + bIx| + 62x2 + 63×3+
logit (y) = a + bx
Odds = Probability of an event happening + Probability of an event not happening
y = at bx
Which of the following is correct when regression line is almost flat?
Correlation is equal to one
Data points shows no trend
Data points shows perfect trend
The slope is equal to one
Which of the following tests are used to assess correlational relationships between two variables when small samples and often skewed?
ANOVA test
Mann Whitney U-test
Pearson's r test
Spearman's rho
What do we need to use when we have to extend the linear regression to situations where the outcome variable is dichotomous or binary?
Analysis of variance
Logistic regression
T-test
Z-test
Which of the following is used in a multiple regression study in order to generalize the findings from the sample to the population?
Adjusted R2
Constant
Slope
Z-value tonal relationships
What is the alternative name of the Mantel-cox test?
Everett and Pickles rank test
Kaplan-Meier test
Log rank Test
Survival function test
When do we reject the null hypothesis and accept that an association exist in the population?
Probability is <0.05
Probability is >0.05
Probability is <0.50
Probability is >0.50
What does a value represent in linear regression formula?
The variable to be predicted
The variable representing the slope of the line
The value of score on the x-axis
The constant
What is the level of strength between two variables when the coefficient of correlation is equal to 0.46?
Perfect
Strong
Moderate
Weak
How do we compare the event of interest across two or more groups in survival analysis?
Using regression line
Using statistical t-test
Using statistical z-test
Using survival curves
Which of the following is an extension of simple linear regression?
Linear categorical regression
Mann- Whitney test
Multiple regression
Non-linear regression
What do we call the easiest form of a curve similar to the survival curve to represent the hazard function?
Cumulative hazard function
Hazard chart
Histogram
Scatter plot
Which one of the following refers to a characteristic that can be measured and can take different values from one person or situation or time to another?
Variance
Value
Variable
Data
Define statistical power?
Describe fishers exact test?
Differentiate between internal rate reliability and test retest reliability?
What does a value represent in linear regression formula?
(a)
