random samples and bias

According to a random telephone survey of 200 adults, 75% of all working adults in the U.S. are satisfied with their current job. What is the population in this survey?

• 200 adults
• adults in the U.S.
• 75% of adults

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

A school randomly chose ten English teachers and asked them which type of juice their students would prefer. Which reason best shows why this sample is not a good sample in this case?

• The sample didn't include students.
• The sample is too small.
• The sample can only be accurate if each teacher is included in the sample

Tags

CCSS.7.SP.A.1

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

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

A survey should always be ____ and ____.

• random and biased
• random and unbiased

Tags

CCSS.HSS.IC.B.3

A public library asked every 10th person who entered to name the type of book they were getting

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

To determine the number of umbrellas the average household in the United States owns, a survey of 100 randomly selected households in Arizona is conducted. Of the households, 24 said that they own 3 or more umbrellas. The researcher concluded that 24% of the households in the United States own 3 or more umbrellas. Is the this a valid conclusion? Justify your answer.

• Valid. The sample is biased.

• Not valid. The sample is biased.

• Valid. The sample is unbiased.

• Not valid. The sample is unbiased.

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Which scenario would produce the least biased results?

• asking athletes at a gym what their favorite television show is
• asking shoppers at a store where their favorite place to shop is
• asking fans at a baseball game who their favorite baseball team is
• asking students in a college library what their favorite college sports team is

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

1. A sample in which every person, object, or event has an equal chance of being selected.

• A. Random sample.
• B. Biased sample.

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

2. When a sample does not accurately represent the population it is a:

• A. Unbiased sample
• B. Biased sample

Tags

CCSS.7.SP.A.1

Isaiah wants to find out what sport seventh grade boys like most. He asks boys, " Is basketball your favorite sport?"

• biased

• random

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2