Populations Samples Inference

Students in Mrs. Walsh’s math class wanted to know the favorite snacks of students in the school. How could they generate a random sample to survey?

• Line up the students by height and choose the first 20 students

• Use the school roster and randomly choose 50 boys.

• Obtain an alphabetized list of all the students in the school and select every seventh student

• Place all the names of the students in Mrs. Walsh's math class in a hat and randomly select 10 students.

_______ is a part of a group being surveyed.

• Sample

• Population

• Quartile

• Random Sample

• 14 7th graders

• 28 7th graders

• 35 7th graders

• 42 7th graders

A school principal wants to see which subject the 695 students in his school liked best. Which choice BEST represents a representative sample?

• The girls in the school.

• 1 classroom for each grade

• All the students in the school.

• The students making a B in math.

As part of a 7th grade statistics project, the teacher brings a candy jar full of gumballs (red & green). The assignment is to estimate the proportion of red gumballs in the jar. Suppose one of the students draws 25 gumballs from the jar: 8 are red, 17 are green. What is the SAMPLE?

• 25 gumballs drawn

• all gumballs in the jar

• the students

• the 17 green gumballs

• 14 7th graders

• 28 7th graders

• 35 7th graders

• 42 7th graders

River Bluff High School has a student population of 3020. In a sample of 250 students, 170 of them were female athletes. Approximately how many students in the entire population should be female athletes?

• 170

• 205

• 2,054

• 2,770

Mrs. Debenport surveyed 8 random band members and found that 3 members play more than one instrument. Use her results to predict how many of Meadow Glen's 152 band members play more than one instrument.

• 3/8

• 57

• 95

• 405