Statistics!

Samples

100

Bob is performing a survey to figure out what his schools favorite ice cream flavor. There are 600 students total in his school, but he only surveys the first 25 in all his classes. What is the population?

The first 25 in his classes.

200

Jack has the complete a survey for school. He asks all 35 students in his 1st period. What is the sample?

The 35 students in 1st period

300

Mary is completing a survey in her ballet class. She asks 12 of the 24 students. What is the sample?

The sample is the 12 students.

400

Tiffany is conducting a survey on peoples favorite fruit. She asks people in her school of 400 total students. She asks 23 at lunch then she asks 12 in her next class. What is the sample?

35

500

Darla is making a survey. She asks 26 students in the classroom with 54 total students. What is her sample?

26

Population

100

Bob is performing a survey to figure out what his schools favorite ice cream flavor. There are 600 students total in his school, but he only surveys the people in all his classes. What is the population?

600 is the population

200

Adam has to complete a survey for band. He has to ask people what there favorite instruments are. He ramdomly selects 45 students in the lunchroom because he can't speak to all 650 students. What is the population?

the 650 students

300

Jimmy is gathering answers for a survey. He asked everyone in his classes which is half of the total of 300 students in the whole school. What is the population?

300 students

400

Derek is surveying people on their favorite holidays. His school has 345 students in total, but he only asks 26 students. What is the population?

The population is 345 students

500

Rachel is doing a survey. She asks 50 of the students in the school out of the 340 total students. What is the population?

340 students

Random Samples

100

The randomly selected 45 students in the lunchroom.Adam has to complete a survey for band. He has to ask people what there favorite instruments are. He ramdomly selects 45 students in the lunchroom. What is the random sample?

The random sample is the 45 students in the lunchroom.

200

Daniel is asked to do a survey for science. There are 432 students in total at the school, so he can't ask everyone. Instead he asks 50 randomly selected people in the lunchroom. What is the random sample?

The random sample is 50 students in the lunchroom.

300

Daisy is conducting a survey for Spanish. When at lunch Daisy goes up to 43 random students. What would be her random sample?

Her random sample would be the 43 students because she randomly chose them.

400

Sara is preparing a survey. She asks all 19 people in her social studies class. Is her selection random or not?

No it is not because she just asked all the people in her social studies class.

500

Seth is completing a survey. He asks 27 random people in the parking lot. Is his selection random?

Yes because any of the people in the parking lot could have been chosen.

True or False

100

Adam has to complete a survey for band. He has to ask people what there favorite instruments are. He ramdomly selects 45 students in the lunchroom. Adam believes that this survey is biased. True or false.

False because he randomly selected the students so it could have been anyone.

200

Gina is making a survey for social studies. She asks all 92 students in the lunchroom out of the 812 total. She believes that her selection is unbiased. True or false.

False

300

Harry is asked to complete a survey on peoples favorite fast food restaurant. He goes up to 56 random people walking around the streets and gets their answers. He believes that his selection is unbiased. True or false?

True

400

Kayla is conducting a survey on favorite colors. She asks only the people in her 4th period. She believes that her selection is biased. True or false.

True because the only people that were able to be in the survey was the people in her 4th period.

500

Wayne is doing a survey. He asks 57 random people in the mall. Is his selection biased?

No because everyone in the mall had an equal chance of getting chose.

Test Quest

100

Sample or population?

Maddy is going to email a survey to all the teachers in the school.

Population

200

Sample or population?

Kevin will ask every 5th students entering the building who they plan to vote for in the presidential election. 

Sample

300

A pizza store surveyed a random sample of 60 trinity food festival attendees about their favorite type of pizza. 30  of them said that the sausage pizza is their favorite. There are a total of 1600 attendees. Find a reasonable estimate.

800

400

For a sample to be random, every member of the population must have an equal chance of being selected for the sample. Suppose you want to know the most popular song among 7th grade students at your school. The population is all 7th grade students, so your sample must be randomly selected from this population.

Plan 1: Ask all students in the choir to tell you their favorite song. Plan 2: Ask every 20th student at the main entrance of the 7th grade wing of the school in the morning to tell you their favorite song.

Plan 2 is random, since not everyone will be in chorus. 

500

Rylie randomly surveys 7th graders in his school and finds that 6 of the 30 students attend summer camp. If there are 200 students, about how many will attend camp?

40