Inferences Review

To get valid results, a sample must be...

• biased

• unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A school newspaper will survey students about the quality of the school’s lunch program. Which method will create the least biased results?

• Twenty-five vegetarians are randomly surveyed.

• Twenty-five students are randomly chosen from each grade level.

• Students who dislike the school’s lunch program are chosen to complete the survey

• A booth is set up in the cafeteria for the students to voluntarily complete the survey.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Which would be a good Unbiased group?

• every third student entering the building

• every member of the varsity football team

• every member in Ms. Zimmer’s drama classes

• every student having a second-period French class

Tags

CCSS.RL.11-12.6

1.  Carlos wants to know the favorite sport of people at his school so he asks his baseball team.

• Biased
• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Brazil asks 7 classmates how many erasers and pens they carry in their bags. The mean number of erasers is 10. The mean number of pens is 4. What inference could Brazil make using this data?

• Most of Brazil's classmates carry more pens than erasers in their bags.

• All of Brazil's classmates carry more erasers than pens in their bags.

• Most of Brazil's classmates carry more erasers than pens in their bags.

• Most of Brazil's classmates carry similar amounts of erasers and pens in their bags.

Tags

CCSS.7.SP.B.4

The dot plots show the weights of a random sample of fish from two lakes. Pick the statement that describes the variability of the samples.

• The variability of the weights of the fish in Lake S is greater than the variability of the weights of the fish in Lake R.

• The variability of the weights of the fish in the two lakes are about the same.

• The variability of the weights of the fish in Lake R is greater than the variability of the weights of the fish in Lake S.

• You cannot determine variability based on a dot plot.

Tags

CCSS.7.SP.B.4

Which data set shows a greater spread?

• Chess Club
• Checkers Club
• They have the same spread.
• You cannot tell from the box plots. 

Tags

CCSS.7.SP.B.4

What is the IQR of the Cruisers?

• 4
• 6

Tags

CCSS.6.SP.B.5C

Which box and whisker plot has the highest median?

• Top plot
• Bottom plot

Tags

CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

What is the range?

• 97.2

• 4

• 3.3

• 3.2