Understanding Inferences from Random Samples

What is the main focus of the video tutorial?

• Learning about algebraic equations

• Understanding inferences from random samples

• Studying historical events

• Exploring geometric shapes

If 3/5 of students eat lunch in the cafeteria, how many students eat there if there are 800 students in total?

• 600

• 500

• 480

• 300

What is the proportion used to calculate the number of students eating in the cafeteria?

• 3/5 = x/800

• 5/3 = x/800

• 5/3 = 800/x

• 3/5 = 800/x

If 30% of residents oppose a new park, how many oppose it if there are 20,000 residents?

• 12,000

• 9,000

• 6,000

• 3,000

What percentage of residents oppose the new park?

• 40%

• 50%

• 30%

• 20%

How many dentists do not prefer Crest if 4 out of 5 prefer it and there are 12,000 dentists?

• 3,000

• 2,400

• 9,600

• 4,800

What is the proportion used to find dentists not preferring Crest?

• 1/5 = x/12,000

• 5/4 = x/12,000

• 4/5 = x/12,000

• 1/4 = x/12,000

If 70% of students ride the bus, how many do not ride it if there are 800 students?

• 160

• 560

• 240

• 320

What is the first step to find out how many students do not ride the bus?

• Divide 70% by 800

• Add 70% to 800

• Subtract 70% from 100%

• Multiply 70% by 800

How do you calculate the number of students not riding the bus?

• Add 560 to 800

• Multiply 560 by 800

• Subtract 560 from 800

• Divide 560 by 800