Random Sampling, Making Predictions, & Estimating Population

You know what a biased sample is. Using that information, what would you say an 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.7.SP.A.1

CCSS.HSS.IC.A.1

Mrs. Connie wants to know the average student’s opinion of the tardy policy at our school. Which group of students should she survey in order to achieve the most accurate-non-biased results?

• 30 students who are often tardy

• 30 students who are rarely tardy

• 30 7th grade students

• 30 randomly selected students from our school

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Mr. Thrasher wants to know how the students at Cedar Bluff rate the cafeteria. He surveyed the hungry baseball team after practice last week to rate the school cafeteria. Is this a biased sample of the school's population?

• Yes, because it only asked one group of students

• No, the baseball team has the smartest students

• Yes, because it's voluntary survey

• No, the baseball team are good food critics

Tags

CCSS.RL.11-12.6

Solve for x 

• x = 16
• x = 28
• x = 1/26
• x = 26

Tags

CCSS.6.EE.B.7

A manager samples receipts of every fifth person in line. Out of 50 people, 4 had a mispriced item. If 600 people go to the store each day, how many can you expect to have a mispriced item?

• 50 people

• 80 people

• 48 people

• 12 people

Tags

CCSS.7.SP.A.2

Jenny randomly selects 20 boxes of crayons from the shelf and finds two boxes with at least one broken crayon. If the shelf holds 130 boxes, how many would you expect to have at least one broken crayon?

• 10 boxes

• 13 boxes

• 6.5 boxes

• 2 boxes

Tags

CCSS.7.SP.A.2

A middle school has 490 students. Mae surveys a random sample of 60 students and finds that 24 of them have dogs. How many students are likely to have dogs?

• 8 students

• 40 students

• 192 students

• 196 students

Tags

CCSS.7.SP.A.2

Part of the population of 10,800 hawks at a national park are building nests. A random sample of 72 hawks shows that 12 hawks are building nests. Estimate the number of hawks building a nest in the population.

• 1,800 hawks

• 150 hawks

• 432 hawks

• 10,800 hawks

Tags

CCSS.7.SP.A.2

A random sample of dogs at different animal shelters shows that 12 of 60 dogs are puppies. The cities shelters collectively house 1,200 dogs each year. Estimate how many are puppies.

• 50 puppies

• 240 puppies

• 20 puppies

• 600 puppies

Tags

CCSS.6.RP.A.3B

There are 600 students at Hilda’s school. Out of 30 students she surveys, 8 of them ride their bikes to school. Estimate how many students ride their bikes to school from the population.

• 160 students

• 20 students

• 74 students

• 240 students

Tags

CCSS.7.RP.A.3