Biostatistics and Data Analysis Quiz

What is the first step in the statistical process?

• Analyze

• Collect

• Conclude

• Design

Which statistical test is used to determine significant differences in survival rates?

• T-test

• ANOVA

• Chi-square

• Regression

What does the standard deviation measure?

• Average of all values

• Spread of data points from the mean

• Difference between maximum and minimum values

• Proportion of data in a category

In which type of study is data collected without manipulating variables?

• Cross-sectional Study

• Longitudinal Study

• Observational Study

• Experimental Study

What is the purpose of using stratified sampling?

• To ensure random selection

• To compare different groups

• To reflect natural conditions

• To eliminate bias

Which measure of central tendency is resistant to outliers?

• Mean

• Median

• Mode

• Range

What does the interquartile range (IQR) measure?

• Spread of the entire dataset

• Spread of the middle 50% of data

• Average of squared deviations

• Difference between mean and median

What type of data is represented by bacterial colony morphologies?

• Discrete Data

• Continuous Data

• Categorical Data

• Quantitative Data

Which of the following is a characteristic of experimental studies?

• Collect data without manipulation

• Test different treatments under controlled conditions

• Cannot establish causation

• Reflect natural conditions

What is the definition of a parameter in statistics?

• Measure describing a population characteristic

• Measure describing a sample characteristic

• Value occurring with greatest frequency

• Average of all values