Random Samples

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 US

• 75% of adults

Clementine completes a report by asking 70 students across campus. She found that 48% of KVMS students do not wash their hands after using the bathroom. What is the sample size?

• 48

• 100

• 70

• All KVMS students

A recent survey of 800 seventh graders from across the state shows 4 out of 10 like to play paper football. How many students said they like to play paper football?

• 40

• 200

• 320

• 800

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

Aaliyah 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 at school

The entire group studied is called the

• sample

• population

The part of the population being studied is called the

• sample

• population

• random

A U.S. senator from Pennsylvania wants to find out the opinion of the voters in his state on issues concerning education. The office of the senator passes out surveys on ten street corners in the five major cities in the state of Pennsylvania. Is this random?

• yes

• no

Leslie surveyed the 9 youngest students in the elementary school. Is this sample of the students in the school likely to be representative of all the students in the school?

• yes

• no

A student wants to find the favorite lunch of 7th graders across the state of Pennsylvania. She uses a sample of 200 randomly selected 7th graders at KVMS. What conclusion can you draw about this sample?

• It is a good sample

• It is not a good sample because it did not include 6th and 8th graders

• It is not a good sample because it is too small

• It is not a good sample because it did not include students from other schools in the state