Week 6

What is a contingency table used for?

• Summarizing the relationship between two categorical variables

• Displaying numerical data trends over time

• Calculating the mean of a dataset

• Organizing a list of items alphabetically

What does a "two way" contingency table refer to?

• Two numerical variables

• Two categorical variables

• Two continuous variables

• Two ordinal variables

What does a "2 X 3" contingency table represent?

• 2 numerical variables by 3 numerical variables

• 2 categorical variables by 3 categorical variables

• 2 category variable by a 3 category variable

• 2 ordinal variables by 3 ordinal variables

In the table convention described, which variable is typically represented by the rows?

• Dependent variable

• Independent variable

• Control variable

• Random variable

What is a useful first step in looking at potential differences between groups with nominal variables?

• Calculating averages

• Using percentages

• Conducting interviews

• Creating pie charts

Why should percentages be used when comparing groups?

• To simplify data entry

• To enable comparisons between groups

• To increase data size

• To eliminate outliers

What should you consider when calculating percentages?

• Whether you are using decimals or fractions

• Whether you are calculating by row or by column

• Whether you are using a calculator or computer

• Whether you are using primary or secondary data

In the chi-square formula, what does "O" stand for?

• Chi-square

• Observed frequency

• Expected frequency

• Total frequency

In the chi-square formula, what does "E" represent?

• Expected frequency

• Observed frequency

• Chi-square

• Error frequency

What is the formula for calculating the expected value in a frequency table?

• (row sum + column sum) / table sum

• (row sum * column sum) / table sum

• (row sum - column sum) / table sum

• (row sum / column sum) * table sum