Chapter 1 Review: Stats Modeling the World

What kind of variable is the response?

A June 2011 Gallup Poll asked Americans, “Thinking about the job situation in America today, would you say that it is now a good time or a bad time to find a quality job?” The choices were “Good time” or “Bad time”.

• Quantitative variable

• Categorical variable

What kind of variable is the researcher studying?

A medical researcher measures the increase in heart rate of patients under a stress test.

• Quantitative variable

• Categorical variable

Before a nation-wide election, a polling place was trying to see who would win. Which choice BEST represents a sample?

• A selection of voters over age 50.

• A selection of male voters.

• All voters.

• A selection of voters of different ages.

A restaurant chain wanted to find out how the customer experience was in a store. Which choice BEST represents a sample?

• 1 out of every 35 customers.

• All of the people who ate at the store.

• 240 customers who spent more than $10.

• 299 customers who filled out complaint cards.

A mayor wanted to see if the people in his town thought he was doing a good job. Which choice BEST represents a sample?

• 124 voters.

• The residents of the town.

• 271 voters age 21 to 30.

• Local business owners.

A survey company was trying to see if people in a state thought the pollution was too high. Which choice BEST represents a population?

• Every person in the state.

• A selection of people from each neighborhood in the state.

• A selection of people who live in dirty neighborhoods.

• A selection of people who live in small towns.

A school principal wants to see which subject the 845 students in his school liked best. Which choice BEST represents a population?

• The students in 3rd grade.

• The first 77 students who come into the school.

• The students making a B in math.

• All the students in the school.

A musician wanted to see what people who bought his last album thought about the songs. Which choice BEST represents a population?

• Every person who brought the album.

• A selection of 7,285 people who bought the album.

• A selection of people who didn't want to buy the album.

• Every person from ages 5-12 who bought the album.

This type of variable is the kind where a number acts as a numerical value.

• Categorical variable

• Quantitative variable

How many of these variables are QUANTITATIVE variables?

**Time it takes to get to school.

**Number of shoes owned.

**Hair color.

**Temperature of a cup of coffee.

**Teacher salaries.

**Zip code

**Gender

• 2

• 3

• 4

• 5