Unit 3 Quiz Review

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 29

• 2.26

• 16.45

• -2.26

• 1.26

Tags

CCSS.HSS.ID.A.4

Find the Z-score.

Mean = 21

Standard Deviation: 1.3

x = 22

• 0.77

• 5.33

• 1.07

• 1.26

Tags

CCSS.HSS.ID.A.4

If heights of 3rd graders follow a normal distribution with a mean of 52 inches and a standard deviation of 2.5 inches, what is the z score of a 3rd grader who is 47 inches tall? 

• -5
• -2
• 2
• 5

Tags

CCSS.HSS.ID.A.4

Lucio wants to know whether the food he serves in his restaurant are within a safe range of temperatures. He randomly selects 70 entrees and measures their temperatures just before he serves them to his customers.

• The population is all of the hot entrees Lucio serves; the sample is the entrees that are a safe temperature.

• The population is the 70 selected entrees; the sample is the entrees that are a safe temperature.

• The population is all of the entrees Lucio serves; the sample is the 70 selected entrees.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

A group of librarians are interested in the numbers of books and other media that patrons check out from their library. They examine the checkout records of 150 randomly selected adult patrons.

• The population is all adult patrons of the library; the sample is the 150 patrons selected.

• The population is all patrons of the library; the sample is the adult patrons of the library.

• The population is all patrons who check out at least 111 book from the library; the sample is the 150 patrons selected.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

Administrators at Riverview High School surveyed a random sample of 100 of their seniors to see how seniors at the school felt about the lunch offering at the school's cafeteria.

• The population is all high school seniors in the world; the sample is all of the seniors at Riverview High.

• The population is all students at Riverview High; the sample is all of the seniors at Riverview High.

• The population is all seniors at Riverview High; the sample is the 100 seniors surveyed.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

If every individual in a population has the same chance of being included in a sample, the sample is a(n) _________ sample.

• Voluntary Response Sample

• Convenience Sample
• Simple Random Sample

• Stratified Sample

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

Marianne wanted to know students' opinion on the new schedule at school. She places students' names in a container and randomly picks out 20 names. 

• Convenience Sampling
• Systematic Sampling
• Simple Random Sampling

• Volunteer response

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

Why do we randomly select our samples?

• for control
• reduce bias
• so we don't get the same answers from everyone
• to eliminate confounding results

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the five closest to her desk.

• Random Sample

• Voluntary Response Sample

• Convenience
• Simple Random Sample 

Tags

CCSS.7.SP.A.1