Chapter 2, Problem 2.1E

A sociologist assembles a dataset consisting of the poverty rate, per capita income, serious crime rate, and teen birthrate for the 50 states of the United States.

1. How many variables are in this dataset?
2. What is an observational unit in this dataset?
3. What is the sample size for the dataset?

To determine

(a)

To Find:

The number of variables in the data set

Answer to Problem 2.1E

  $4$ variables

Explanation of Solution

The data set assembled by the sociologists consists of four variables such as the poverty rate, per capita income, serious crime rate, and teen birth rate for the $50$ states of the United states.

To determine

(b)

To Find:

The observational unit in this dataset

Answer to Problem 2.1E

A state of the united states

Explanation of Solution

Since the sociologists observes these four variables in the $50$ states of the United states, the observational unit is then a state in the united states.

To determine

(c)

To Find:

The sample size for the dataset

Answer to Problem 2.1E

  $50$

Explanation of Solution

Since the sociologists observes those variables in $50$ observational units, the sample size is $50$.