Chapter 1-4 review

A researcher wants to investigate the effect of a new teaching method on student performance. They divide students into two groups: Group A receives the new teaching method, while Group B receives the traditional method. What type of study design is this?

• Experimental study

• Observational study

• Cross-sectional study

• All of the above

A company collects data on the number of hours its employees spend on a task. The distribution of the data is skewed to the right. Which measure of central tendency is most appropriate to summarize the data?

• Mean

• Median

• Mode

• Range

Which of the following is an example of qualitative data?

• height

• Temperature

• Gender

• Weight

Which of the following is a secondary source of data?

• Surveys

• Interviews

• Experiments

• Government reports

Which type of graph/chart is used to display the distribution of a categorical variable?

• Line chart

• Bar chart

• Scatter plot

• None of the above

Which sampling method involves dividing a population into subgroups and randomly selecting members from each subgroup?

• Simple random sampling

• Systematic random sampling

• Stratified sampling

• Cluster sampling

A researcher is comparing two Investments, Investment A and Investment B, with the same mean but different standard deviations. Which measure of variation would be most appropriate to use to quantitatively compare the spread or variability between the two investments?

• Mean

• variance

• Standard deviation

• Coefficient of variation

A researcher wants to visualize the relationship between two continuous variables. Which type of graph or chart would be most appropriate for displaying this relationship?

• Bar chart

• Pie chart

• Line graph

• None of the above

The covariance between two variables is calculated as -50. What does this indicate about the relationship between the variables?

• There is a strong positive relationship

• There is a strong negative relationship

• There is no relationship between the two variables

• There is a negative relationship

The coefficient of correlation between two variables is calculated as 0.8. What does this indicate about the strength and direction of the relationship between the variables?

• There is a strong positive relationship.

• There is a strong negative relationship.

• There is a weak positive relationship

• There is a weak negative relationship