Daily Grade: Statistics: Inferences

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

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.1

CCSS.7.SP.A.2

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.RP.A.2

CCSS.7.RP.A.3

CCSS.7.SP.A.1

CCSS.7.SP.A.2

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

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

• Response Bias
• Convenience Sampling
• Nonresponse
• Voluntary Response

Tags

CCSS.7.SP.A.1

A population is a collection of all individuals, objects, or measurements of interest.

• True

• False

A portion or part of a population is called a

• Random survey

• Sample

• Tally

• Frequency distribution

a sample you get when you ask for volunteers

• voluntary response sample

• biased sample

• convenience sample

• simple random sample

What can you "infer" by reading the passage below?

"I hate the idea of having all those people out there watching me...I just don't like it when I'm around so many people. I wish I just could hide somewhere," whispered Violet.

• Violet can be a mean girl.
• Violet can be somewhat relaxed.
• Violet is probably somewhat shy.
• Violet is afraid of everything.

The most accurate and complete inference based on the photo is:

• A. The children are participating in a race at school.
• B. The children are competing against one another.
• C. A boy tries to catch up to a girl as they race on the beach.
• D. A little girl expresses her joy as she wins a race against her peers.