Intro to Samples and Populations

Complete the definition:

A _________ consists of all subjects (human or otherwise) that are being studied

• Statistics

• Number

• Group of people

• Population

Complete the definition:

A _______ is a subset of a population

• sample

• group

• people

• statistics

The town counsel wants to poll all the businesses in town on their store hours. They receive letters from 73 businesses in town.

Identify the Sample.

• 73 businesses who return the letters

• All businesses in town

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

The town counsel wants to poll the businesses in town on their store hours. They sent out 200 letters to all the businesses in town, and 73 businesses returned the letter.

Identify the Population.

• 73 businesses who return letters

• All businesses in town

Tags

CCSS.HSS.IC.A.1

Why do we randomly select our samples?

• because it is easier

• reduce bias to better represent the population

• so we don't get the same answers from everyone

When examining the alphabet, which is an example of a sample?

• The entire alphabet

• Vowels

• Negative Integers

The seniors at Kennedy High School are going to vote where the senior trip should be. The teachers need 100 votes before they can make a final decision. Identify the population.

• Seniors at Kennedy High School

• Teachers at Kennedy High School

• 100 senior voters

Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

• thirty students who are often tardy

• thirty students who are rarely tardy

• thirty of her friends

• thirty randomly selected students from her school

You ask 75 randomly chosen students at a school how many movies they watch each week.Is the sample representative of student movie preferences? Explain.

You ask 75 randomly chosen students at a school how many movies they watch each week.

What percent of students watch one movie per week?

• 28%

• 21%

• 87.5%

• 70%