Making Inferences

Fill in the Blanks

Multiple Choice

Trinity asked a random sample of 50 students at her school if they brought lunch from home today. If 30 answered “yes,” about what percent of students at Trinity’s school brought lunch from home today?

• 15%

• 30%

• 50%

• 60%

Multiple Select

A representative sample of 80 customers in a clothing store was surveyed about how they paid for their purchases. The table shows the responses. Based on the results, which of the following are valid inferences. Select all that apply.

• Tomorrow, 8 out of the first 80 customers will for sure pay with a gift card.

• In a group of 40 customers, it is expected that about 10 will pay with cash.

• About 0.3, or 30%, of all the store's customers will pay with a credit card.

• A sample of 100 customers would provide less reliable data.

Drawing Inferences

By Maria Apostol

Multiple Choice

What is the highest average grade in Math of grade 6 students?

• 88

• 89

• 90

• 91

Multiple Choice

Your school has received a grant to upgrade the school library. The librarians used a random sample of 50 students from the entire school. Of the 50 students, 27 would like to see more laptops available for student use. What can be inferred from this information?

• Most students in the school would like to have more laptops available in the library.

• Exactly 46% of the students in the school would like to have an upgrade other than    laptops for the library.

• About half of the students want the grant money to be used to buy more laptops for student use.

• Students who use the library the most need more laptops.

Multiple Choice

The manager of a music store surveyed a random sample of customers who shop in the store about their favorite type of music. The table shows the number of customers who selected each type of music.

Based on the information in the table, which inference about the favorite type of music of all the customers who shop in the music store appears to be valid?

• they are certain to select rock or pop music.

• They are less likely to select country or rap music than rock music.

• They are more likely to select country music than jazz, classical, or rap music.

• They are certain to select any type of music other than jazz music.

Multiple Choice

The Table above shows the points scored by the 7th grade basketball team from the previous season. What is the mean, median and mode of the data set?

• Mean: 28

  Median: 26

  Mode: 20

• Mean: 27

  Median: 26

  Mode: 20

• Mean: 25

  Median: 28

  Mode: None

• Mean: 28

  Median: 28

  Mode: 20