As part of a data base on new births at a hospital some variables recorded are the age of the mother, marital status of the mother (single, married, divorced), weight of the baby, and gender of the baby. Of these variables

A. age, marital status, and weight are quantitative variables.
B. age and weight are categorical variables.
C. gender and marital status are categorical variables.
D. gender, marital status, and age are categorical variables.

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To determine the correct answer, we need to understand the definitions of quantitative and categorical variables.

Quantitative variables are numerical variables that represent quantities or measurements. They can be further divided into two types: discrete and continuous. Discrete variables can only take on specific values, while continuous variables can take on any value within a range.

Categorical variables, on the other hand, are non-numerical variables that represent categories or groups. They can be further divided into two types: nominal and ordinal. Nominal variables have categories with no specific order, while ordinal variables have categories with a specific order or ranking.

Now let's analyze the given variables:

1. Age of the mother: Age is a quantitative variable as it represents a numerical measurement.

2. Marital status of the mother: Marital status is a categorical variable as it represents different categories or groups (single, married, divorced).

3. Weight of the baby: Weight is a quantitative variable as it represents a numerical measurement.

4. Gender of the baby: Gender is a categorical variable as it represents different categories or groups (male, female).

Based on the analysis, the correct answer is:

C. Gender and marital status are categorical variables.