Statistics Target 2: Types of Samples

Random samples are more representative of populations than convenience samples.

What TWO words below describe convenience samples?

• Unfair

• Quick

• Trustworthy

• Accurate

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

What is human bias?

• When a person or group of people use their emotions or opinions to make decisions that may be unfair

• When a person or group of people make choices that benefit one group over another

• When a person or group of people interfere with a process that skews the results

• All of these answers are correct

Which TWO statements must be true about a sample in order to classify it as RANDOM?

• The sample must take very little time and effort to collect the data

• Every element in the population must have an equal opportunity to be selected

• A random number generator must be used to choose the elements for the sample

• Human bias must be absent from the sample selection

Tags

CCSS.HSS.IC.B.3

You want to select a sample from all students at your school. Which of the following selection methods would be considered random?

• Select your five best friends in each grade

• Using a random number generator and a roster, select 50 seventh grade students.

• Select students at school whose last name begins with the letter D.

• Place all students' names in a bowl, and draw 30 names.

Tags

CCSS.HSS.IC.B.3

Why is it important that samples from populations be random?

• So we can trust the data collected and make inferences about the population

• So Mrs. Dever doesn't get upset

• So we can quickly select the sample and save time

• So we can use technology

Tags

CCSS.HSS.IC.B.3