7th Grade Statistics

Susan polled 587 people throughout each city in her county.  Each city is the same size.  Is this sample of the residents of cities in the county likely to be biased?

• yes
• no

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.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.7.SP.A.1

CCSS.HSS.IC.A.1

Aaron took a multiple choice test.  There were 25 questions, of which he answered 4 incorrectly.  At this rate, how many questions should Aaron expect to answer incorrectly if he takes a test with a total of 150 questions?

• 123
• 24
• 373
• 47

Tags

CCSS.6.RP.A.3B

There are 480 students in Marla’s school.  In her classroom, there are 3 left-handed students and 17 right-handed students.  Predict the number of left-handed students in the whole school.

• 72
• 85
• 124
• 208

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

CCSS.7.RP.A.2

CCSS.7.RP.A.3

The results of a random survey showed that 42 out of 84 people plan to vote for Coach Vasquez for teacher of the month. Which is the best prediction of the total number of votes he will receive if 2,000 people vote?

• 825
• 750
• 1200
• 1000

Tags

CCSS.6.RP.A.3B

At a middle school, the 7th graders will conduct a survey for where 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.HSS.IC.A.1

A state fair had 1,019,887 people in attendance. The fair committee performed a survey. The question was, “What do fairgoers enjoy most about the fair?” Of those who responded, 83% reported eating traditional foods. Which group of people represents the sample group?

• Fair goers who like traditional foods
• The fair committee
• Fair goers who responded to the survey
• All fair goers

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.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.HSS.IC.A.1

Valid or invalid?: Mr. Bowker wants to know how many students like sports so he randomly surveys 20 football players and 10 volleyball players. Of the 30 students surveyed, 100% like sports. 

• Valid
• Invalid

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Source of bias that occurs when you ask people who are EASY to ask

• Response Bias
• Convenience Sampling
• Nonresponse
• Voluntary Response

Tags

CCSS.HSS.IC.B.3