5/2 Morning

Biased or Random?

You want to survey the students in your school about their exercise habits. At lunchtime you stand by a vending machine. You survey every student who buys something from the vending machine.

• Biased sample

• Random sample

Biased or Random?

Audi wants to find out how students get to school at Churchill so she places the names of all students into a fish bowl and pulls out 50 so she can survey them.

• Biased sample

• Random sample

How many scores are listed in this Stem and Leaf Plot?

• 3
• 6
• 9
• 18

How many students spent over 40 minutes but under 60 minutes studying?

• 22 Students
• 30 Students
• 8 Students
• 5 Students

The graph below shows the number of sunny days and rainy days in a city during four months.

Based on the graph,how many more sunny days than rainy days did this city have during the months of April, May, and June?

• 21
• 56
• 26
• 20

How many total people took the survey?

• 50
• 150
• 100
• 200

How many students scored 93% or less?

• 6
• 16
• 14
• 13

At an assembly 7 out of 10 students who entered the gym were carrying a backpack. Based on this information, if 700 students were at the assembly, how many students could be expected to be carrying a backpack?

• 49

• 490

• 210

• 421

The Student Council asked every tenth student in the lunch line how they preferred to be contacted with school news. The results are shown in the table. Is this an unbiased sample? If yes, suppose there are 684 students at the school. How many can be expected to prefer E-mail?

• No, it's a biased sample

• 432

• 304

• 16

Is this sample biased or unbiased?

A sample of 50 students who currently have an A in math.

• Biased

• Unbiased