7.SP.1 Understand Random Samples

The Sparkle Cola Company wants to know which flavor of cola people aged 13−18 prefer. Which group would be the best to sample to achieve accurate results?

• A group of 1,000 people who graduated high school before the year 2000.

• A group of parents who have middle school-aged and high school-aged children.

• A group of five students from each middle school and high school homeroom in a school district.

• Every high school-aged girl in a school district.

Joey plans to survey his classmates about which presidential candidate for whom they will vote.  Which group(s) of classmates should Joey poll for valid results.

Select ALL that apply.

• randomly selected classmates of both genders

• randomly selected classmates in the Environmental Club

• randomly selected females in his class

• randomly selected classmates from each homeroom

The Yum-Yum Candy Factory wants to know which type of candy is most popular with people aged 30-50. Which would be the best group to sample?

• A group of middle school students who buy candy at least once a week.

• A group of parents with middle school aged children.

• A group of adults who have at least five grandchildren.

• A team of professional basketball players.

Joy and Tyler conduct a survey on the favorite video games of all middle school-aged students. Which population sample produces the most valid results for the survey?

• surveying all 7^th grade boys

• surveying every 5^th student who walks into school in the morning

• surveying every girl on the volleyball team

• surveying every other student in the eighth grade lunch line

A store wants to know if a new flavor of chips will appeal to young people. Which sample best represents the population of interest?

• every female under the age of 55

• every fifth person under 25 who comes into the store

• every parent of a toddler

• everybody who has bought chips in the last month