Symbols for Categorical and Quantitative Variables

Categorical Variable: Shape for Large Sample Size (n)

Approximately normal

Quantitative Variable: Shape for Large Sample Size(n)

Normal or approximately normal.

Quantitative Variable: When is n Large?

When population is normal or n>=30

Categorical Variable: When is n Large?

nπ>=10 and n(1-π)>=10

Categorical Variable : Sample Statistic (Sample Proportion)

p̂ (sample proportion)

Quantitative Variable: Sample Statistic (Sample Mean)

x̄ (sample mean)

Quantitative Variable : Center (population mean)

μ

Categorical Variable : Center (Mean)

π