Surveys, experiments and observational studies, and judging a report

Grade 11 Math Worksheet - Building Confidence

NameDate

Circle the best answer, or write your answer on the line.

1.
Noah's class assigns 30 bean plants at random: 15 get plant food and 15 get plain water. Then the class measures their growth. Which kind of study is this?
- A sample survey: it asks a sample questions.
- An observational study: the class only measured what happened to the plants.
- An experiment: the class chose, at random, which plants got plant food.
2.
Pia's class flips a coin for each of 24 paper airplanes to give it long or short wings. Then the class measures every flight. Which kind of study is this?
- A sample survey: it asks a sample questions.
- An experiment: the class chose, by coin flip, which planes got long wings.
- An observational study: the class only measured what happened to the planes.
3.
Zee's class assigns 30 bean plants at random to plant food or plain water. What does the random assignment do?
- It lets the result describe every bean plant in the world, even ones never in the study.
- Nothing: the class could pick the strongest plants for plant food.
- It makes the groups alike, so a difference can be put down to the plant food.
4.
800 dots (students); 40 circled by chance, spread all over the plot. Bo picks 40 of the school's 800 students at random to ask about reading. What does the random pick do?
- It shows what makes students read more.
- Nothing: asking the first 40 at the door works as well.
- It lets the result stand for all 800 students.
5.
600 dots (students); 50 circled by chance, spread all over the plot. Esme picks 50 of the school's 600 students at random to ask about recycling. What does the random pick do?
- Nothing: asking the 50 students in the green club works as well.
- It shows what makes students recycle.
- It lets the result stand for all 600 students.
6.
900 dots (students); 60 circled, drawn at random, spread all over the plot. Kira draws 60 names at random from all 900 students and asks about recycling. Who can the result describe?
- Only the 60 students asked
- All 900 students at the school
- Every student in the country
7.
700 dots (students); the 90 circled are the ones who chose to answer, bunched together. All 700 students could answer Milo's online poll about a later start; 90 chose to answer. Who can the result describe?
- Only the 90 who chose to answer; they may feel strongly
- Every student in the country
- All 700 students at the school
Noah's report graph starts its axis at 80, not 0. A bar shows 86 votes for a class pet. How many units tall is that bar drawn above the axis start?
Pia's report graph starts its axis at 120, not 0. A bar shows 128 students who bike. How many units tall is that bar drawn above the axis start?
Ren's report graph starts its axis at 30, not 0. A bar shows 37 books returned late. How many units tall is that bar drawn above the axis start?

Surveys, experiments and observational studies, and judging a report

Answer Key - Grade 11 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1.
Noah's class assigns 30 bean plants at random: 15 get plant food and 15 get plain water. Then the class measures their growth. Which kind of study is this?
- A sample survey: it asks a sample questions.
- An observational study: the class only measured what happened to the plants.
- An experiment: the class chose, at random, which plants got plant food.
2.
Pia's class flips a coin for each of 24 paper airplanes to give it long or short wings. Then the class measures every flight. Which kind of study is this?
- A sample survey: it asks a sample questions.
- An experiment: the class chose, by coin flip, which planes got long wings.
- An observational study: the class only measured what happened to the planes.
3.
Zee's class assigns 30 bean plants at random to plant food or plain water. What does the random assignment do?
- It lets the result describe every bean plant in the world, even ones never in the study.
- Nothing: the class could pick the strongest plants for plant food.
- It makes the groups alike, so a difference can be put down to the plant food.
4.
800 dots (students); 40 circled by chance, spread all over the plot. Bo picks 40 of the school's 800 students at random to ask about reading. What does the random pick do?
- It shows what makes students read more.
- Nothing: asking the first 40 at the door works as well.
- It lets the result stand for all 800 students.
5.
600 dots (students); 50 circled by chance, spread all over the plot. Esme picks 50 of the school's 600 students at random to ask about recycling. What does the random pick do?
- Nothing: asking the 50 students in the green club works as well.
- It shows what makes students recycle.
- It lets the result stand for all 600 students.
6.
900 dots (students); 60 circled, drawn at random, spread all over the plot. Kira draws 60 names at random from all 900 students and asks about recycling. Who can the result describe?
- Only the 60 students asked
- All 900 students at the school
- Every student in the country
7.
700 dots (students); the 90 circled are the ones who chose to answer, bunched together. All 700 students could answer Milo's online poll about a later start; 90 chose to answer. Who can the result describe?
- Only the 90 who chose to answer; they may feel strongly
- Every student in the country
- All 700 students at the school
Noah's report graph starts its axis at 80, not 0. A bar shows 86 votes for a class pet. How many units tall is that bar drawn above the axis start?
6
Pia's report graph starts its axis at 120, not 0. A bar shows 128 students who bike. How many units tall is that bar drawn above the axis start?
8
Ren's report graph starts its axis at 30, not 0. A bar shows 37 books returned late. How many units tall is that bar drawn above the axis start?
7