Sampling to Draw Inferences About Populations

In order to use samples to estimate something from the population, the sample should be _________________ the population.

• exactly the same as

• nothing like

• representative of

• larger than

Darrien surveys 60 of the actors theater class. He concludes that 8 out of 15 actors have previous acting experience. What is the sample size?

• 60

• 8

• 15

• 53

What inference can you draw by comparing the interquartile ranges?

• There is more variability in the number of days that Team A members trained because the IQR for Team A is greater than the IQR for Team B.

• There is more variability in the number of days that Team B members trained because the IQR for Team B is greater than the IQR for Team A.

• Team A members generally trained for more days than Team B members

• Team B members generally trained for more days than Team A members

What is the sample?

• All students at Commodore

• All students in section 702

• The 10 students Mr. Cardarella picks

• All students in 7th grade

Mr. Cardarella wants to know section 702's favorite food. He picks 10 students in 702 to ask. What is the population?

• All students at Commodore

• All students in section 702

• The 10 students Mr. Cardarella picks

• All students in 7th grade

• 15

• 27

• 45

• 75

100 second graders were asked to do a book report about one of these four zoo animals.  The number of students who chose each animal is shown in the table.  If 250 second graders had to choose of of the four animals, predict how many would choose to write about a giraffe.

• 60 students

• 50 students

• 40 students

• 30 students

150 people were polled on their favorite sport.  Based on the table, if you asked only 25 people what their favorite sport is, how many would say soccer is their favorite sport?

• 5 people

• 6 people

• 8 people

• 10 people

• 2

• 4

• 8

• 16

• 100

• 150

• 200

• 250