Sampling 1

Types of Sampling

​Introduction

When we talk about the entire group that we are interested in, that is called the population. When some members of the group are selected to represent the entire group, that is called a sample. The thing we are interested in knowing about the population is the parameter of interest.

Topic:
Identifying population, sample, and parameter

​Work Activity -20mins

For each scenario below, identify the population, sample and parameter of interest.

​Introduction

​Population

​Sample

Multiple Choice

The local school board wants to get parents to evaluate teachers. They selected 100 parents and found that 89% approved of their child’s teacher.

What is the Population?

• All Parents

• Students

• teachers

• school board

Multiple Choice

The local school board wants to get parents to evaluate teachers. They selected 100 parents and found that 89% approved of their child’s teacher.

What is the Sample?

• 89 parents

• 20 parents

• 100 parents

• 100 students

Multiple Choice

The local school board wants to get parents to evaluate teachers. They selected 100 parents and found that 89% approved of their child’s teacher.

What is the Parameter of Interest?

• % of all teachers who approve of their child's parents

• % of all parents who approve of their child's teacher

• % of all school board who approve of their child's teacher

• % of all students who approve of their teacher

Multiple Choice

Jarret wants to know the average height of the students in his school. There are 753 students in his high school; he finds the heights of 52 of them.

What is the Population?

• All 753 students

• all 52 students

• all teachers

• jarret

Multiple Choice

Jarret wants to know the average height of the students in his school. There are 753 students in his high school; he finds the heights of 52 of them.

What is the Sample?

• all students

• 52 students

• 753 students

• teachers

Multiple Choice

Jarret wants to know the average height of the students in his school. There are 753 students in his high school; he finds the heights of 52 of them.

What is the Parameter of Interest?

• average score on a test

• average age of students

• average weight of students

• average height of all students

Multiple Choice

A government official is interested in the percentage of people at JFK airport that are searched by security. He watches 300 people go through security and observes 42 that are searched.

What is the Population?

• all airplanes at JFK

• all travellers using JFK airport

• all workers at JFK

• all security scanners at jfk

Multiple Choice

A government official is interested in the percentage of people at JFK airport searched by security. He watches 300 people go through security and observes 42 that are searched.

What is the Sample?

• 300 airplanes

• 42 travellers

• 300 travellers

• 300 cargo trucks

Multiple Choice

A government official is interested in the percentage of people at JFK airport searched by security. He watches 300 people go through security and observes 42 that are searched.

What is the Parameter of Interest?

• the proportion of all people searched

• the proportion of all bags searched

• the proportion of all food searched

• the proportion of all kids searched

Multiple Choice

A team of biologists wants to know the average weight of fish in a lake. They decided to drop a net and measure all the fish caught in three different locations in the lake.

What is the Parameter of Interest?

• the avarage weight of fish

• the average height of fish

• the average food fish consume

• the average length of fish

Multiple Choice

A team of biologists wants to know the average weight of fish in a lake. They decided to drop a net and measure all the fish caught in three different locations in the lake.

What is the Sample?

• the fishes caught in the 3 lakes

• the fishes caught in the ocean

• the fishes caught in the 2001

• the fishes caught in 2020

Multiple Choice

A team of biologists wants to know the average weight of fish in a lake. They decide to drop a net and measure all the fish caught in three different locations in the lake

What is the Population?

• All fishes in the 3 lakes

• All fishes in the ocean

• All fishes in 2001

• All fishes in the 2020