Carmen Homework 5 - Regression and Two-Way Tables

A conditional distribution summaries the information from one variable ONLY, without considering ANY information from another variable.

False

Above is a two-way table examining the relationship between gender and whether or not a person smokes. What is the marginal distribution of gender?

Females: 337 / 713 = 0.473 Males: 376 / 713 = 0.527

Your boss gives you the following regression equation. Selling price = $5,240 + $33.80 (Number of Square Feet). What is the correct interpretation of the slope of this equation?

For every additional square foot, we expect a home's selling price to increase by $33.80.

If the conditional distribution is different from the corresponding marginal distribution in a two-way table, we know that the variables are NOT related.

False

Your boss gives you the following regression equation. Selling price = $5,240 + $33.80 (Number of Square Feet). It makes sense to interpret the Y-intercept for this equation.

False

Above is a two-way table examining the relationship between gender and whether or not a person smokes. What number belongs in the missing cell?

251

A two-way table allows us to examine the relationship between categorical variables.

True

Suppose the equation Y = 3.45 - 2.58 (X) represents a valid regression equation: From this information, we know that X and Y have a negative correlation.

True

A manager of a retail store is interested in the relationship between a person's annual income and their total purchase amount. Could he measure this relationship by finding the correlation?

Yes, because income and total purchase amount are quantitative variables.

Your boss gives you the following regression equation. Selling price = $5,240 + $33.80 (Number of Square Feet). The residuals have units of dollars.

True