Quiz Review

Richland 2 has all of the students in the 7th grade take a math test.  Three samples are taken from the results.  Which of the samples are likely to be unbiased?

• 75 randomly selected students in 7th grade
• 100 students who make good grades in math class.

A research company studied a representative sample of people in a city.  The company found that 36 people were born in May and 140 were not.  Decide which of the following inference(s) is(are) valid. 

• About 20% of the population was born in May.
• 104 out of every 140 members in the population were not born in May.
• About 26% of the population was born in May.
• 36 out of every 140  members in the population were born in May.

Lucy is doing research on what people's favorite type of music is. Which of the following is a description of convenience sampling?

• Lucy chooses all the people in her town.
• Lucy chooses the first 30 people she sees.
• Lucy chooses 30 students from each grade at her school.

Maria is doing research on which movies people in her town are seeing.  She stands outside the local theater to ask people what movie they saw.  Which of the following descriptions is an example of systematic sampling?

• Maria asks every person who leaves.
• Maria asks every sixth person who leaves, starting with the fourth.
• Maria asks the first 20 people who leave.
• Maria asks every person who leaves and is wearing glasses.

Your science class is studying the rainfall on the first day of each month for one year.  Which of the samples below is a simple random sample?

• The rainfall on the first day of September, October, and November. 
• The rainfall on the first day of six months, selected randomly.
• The rainfall on the first day of this month.
• None of the above.

The possible results of an action

• odds
• experimental probability
• outcome
• probability

An event with a probability of one

• experimental probability
• outcome
• certain event
• permutation

What is the likelihood of picking a purple card from a standard deck of playing cards?

• certain
• impossible
• likely
• unlikely

The extent to which something is likely to occur is known as - 

• sample space
• an event
• probability
• data

A set of all possible outcomes is known as - 

• a list
• a complement
• a sample space
• an event