Sampling

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.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

Sam tested every 50th candy bar from the assembly line to make sure there were enough peanuts in each bar.  He found 15% did not have enough peanuts.  How many candy bars do not have enough peanuts if the factory produces 20,000 candy bars?

• 300
• 3,000
• 300,000
• 50

Tags

CCSS.6.EE.B.7

CCSS.6.NS.B.3

CCSS.6.RP.A.3

At a middle school, the 7th graders will conduct a survey to decide where they want to go on a field trip. Which method will result in the least biased decision?

• to randomly ask 8th grade students who went on a field trip last year
• to randomly choose some 7th grade students to select a location
• to ask all 7th grade teachers and administrators for a location
• to ask the student council to choose a location

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Unbiased sampling is:

• when you choose the group you think will give you the answer you want, accept volunteers or survey by convenience
• when any member of the population is equally likely to be chosen for the sample

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

Josie threw a handful of identically shaped buttons into the air, then collected the 27 buttons that landed in a target on the floor.  Is this a random sample of the buttons?

• yes
• no

Tags

CCSS.7.SP.A.1

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

• yes
• no

Tags

CCSS.6.SP.A.1

CCSS.6.SP.A.2

Tanner wants to estimate the number of students in his 7th grade class who are interested in starting a computer club. He needs to create a random sample of students. How should Tanner collect his sample size?

• Tanner should ask 30 in the technology class.

• Tanner should ask 30 students who are his closest friends.

• Tanner should ask 30 students in the 7th grade class.

• Tanner should ask 30 students from the entire school.

Lizzy had test scores of:   72, 94, 108, 60
What is the RANGE of her test scores?

• 12
• 72
• 48
• 98

Tags

CCSS.6.SP.A.2

CCSS.6.SP.A.3

CCSS.6.SP.B.5

What is the mode in this set of numbers:
7, 14, 20, 3, 7, 14, 2, 14, 7

• 7
• 20
• 7 & 14
• none of the above

Tags

CCSS.6.SP.A.3

CCSS.6.SP.B.5

Find the mean of these numbers:
4,2,5,6,3

• 2
• 5
• 4
• 6

Tags

CCSS.6.SP.A.3

CCSS.6.SP.B.5