Unit 5B-Statistical Samples Review

Identify the Population:

Wicomico County Public Schools randomly selected 230 teachers to find out which technology resource is the most effective.

• 230 Teachers

• All teachers in the district

• Students

• Wicomico County Public Schools

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A school randomly chose ten English teachers and asked them which type of juice their students would prefer. Which reason best shows why this sample is biased?

• The sample didn't include students.
• The sample is too small.
• The sample can only be accurate if each teacher is included in the sample
• English teachers don't drink juice!

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

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.

Our high school student council surveyed 80 out of 450 students and asked how they feel about starting school later. 56 students said they would like to start school later. Predict the number of students that would like to start school later.

• 255 students

• 285 students

• 300 students

• 315 students

According to a random telephone survey, 85% of all working adults in the U.S. are satisfied with their current job. If I asked 500 adults, how many do you predict would be satisfied with their current job?

• 85 adults
• 340 adults
• 500 adults
• 425 adults

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

CCSS.7.SP.A.1

CCSS.7.SP.A.2

An ice-skating rink inspects 25 pairs of skates and finds 2 pairs to be defective.  The rink has 175 pairs of ice skates. Predict the number of pairs that are likely to be defective.

• 14
• 50
• 7
• 65

Tags

CCSS.7.RP.A.2

CCSS.7.SP.A.1

CCSS.7.SP.A.2

What is the mean of these numbers?
4,5,5,2,3,3,2,8

• 40
• 24
• 4
• 256

Tags

CCSS.7.EE.B.3

What is the median of the data set?
9, 7, 2, 4, 3, 5, 9, 6, 8, 0, 3, 8

• 6
• 7
• 5.5
• 9

Tags

CCSS.7.EE.B.3

What is the definition of the mean?

• Add all the numbers together and divide by the number in the set.

• The middle number after the numbers have been put in order from least to greatest.

• The difference between the highest and lowest numbers

• The number that occurs the most often.

Tags

CCSS.7.NS.A.3

18, 4, 12, 2, 13, 18, 2, 2, 10
What is the mode of this data set?

• 18
• 2
• 16
• 9

Tags

CCSS.HSN.VM.C.6