8th Grade Math- Data Analysis

If six out of 15 customers order a chicken sandwich, how many chicken sandwiches should a restaurant predict they will need to serve 270 people?

108

A cola company wants to test their cola against their biggest competitor's cola. They decide to randomly sample 150 people. The results from their survey show that 98 people out of 150 people prefer their cola to their competitor's. What is the best prediction of the number of people who will prefer their cola if 1,200 people are asked?

784

A group of students wants to determine the favorite snack food at their school. They know they should use a sample because the student population at their high school is 5,000. What is the best way for them to get a random sample of 100 students?

Ask every 20th student until they reach 100 students

A ____________ sample is a sample that isn't representative of the entire population.

Biased

stratified sample

a population is divided into groups and then members are selected from each group

systematic sample

a rule is used to select members from a population

survey

a sampling of a population used to make predictions

A teacher polled only the 8th grade students in English classrooms on what their favorite color is. She found that the favorite color of the school is blue. What kind of sample is this?

biased sample

population

entire group of individuals or items from which samples are taken

random sample

every member of the population has an equal chance of being selected (unbiased sample)

self-selected sample

members of a population that volunteer for a survey

convenience sample

only members of the population who are easily accessible are selected

biased sample

sample not representative of the entire population

sample

small part of a population chosen to represent the entire group

A company surveys every tenth person in the phone book. What type of sampling did the company use?

systematic sample