Making Inferences on Random Samples Practice

Zoie completes a report by asking 70 students across campus. She found that 48% of CIAA students do not wash their hands after using the bathroom. What is the sample size?

• 48

• 100

• 70

• CIAA students

Determine whether the data collected in each survey represent a census or a sample.

After surveying each member of the Math Club, Deanna reports that four out of every five members has a graphing calculator.

• Population

• Sample

The election committee for a candidate running for mayor randomly selects 200 men to complete an online survey. The men are asked to identify which mayoral candidate they are most likely to vote for in the upcoming election. Of the 200 men polled, 42 men chose not to answer and 52% indicated they would vote for candidate Ray. Based on these results, what can be inferred about the outcome of the election?

• Ray cannot possible win the election

• 42 percent of the citizens will not vote.

• Ray is the most popular candidate among men voters

• 48 percent of men plan to vote for a candidate other than Ray.

A store manager selects 30 cartons of eggs and finds 4 cartons that 

    have cracked eggs. If the store has 105 cartons of eggs, how many 

    cartons can she expect to have cracked eggs in them?

Zoie completes a report by asking 70 students across campus. She found that 48% of CIAA students do not wash their hands after using the bathroom. What is the population of her survey?

• the bathroom

• CIAA students

• 48% of students

Determine whether a sample is a random or biased sample. 

  Explain your reasoning.

 A librarian randomly chooses 100 books from the library’s

 database to calculate the average length of a library book.

• The sample is not biased. It is a random sample.

• The sample is biased. It is a non- random sample

• The sample is biased. It is a random sample.

•  The sample is not biased. It is a non- random sample

A recent survey of 800 seventh graders from across the state shows 4 out of 10 like to play paper football. How many students said they like to play paper football?

• 40 students
• 200 students 
• 320 students
• 8,000 students

Determine whether the data collected in each survey represent a population or a sample.

Chris surveys each of the students in his seventh grade class. He concludes that 50% of all seventh graders have at least one sibling.

• Population

• Sample

Jon finds a box of 350 postcards. He selects a random sample of 75 postcards and finds that 27 already have a stamp on them. Predict the total number of postcards in the box with stamps on them.

• 9,450 postcards

• 126 postcards

• 13 postcards

• 5 postcards

_______ is the entire group of objects or individuals considered for a survey.

• Sample
• Population
• Random Sample
• Quartile