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City Councilwoman Kelly wants to know whether the residents of her district support a proposed school redistricting plan.

Which of the following survey methods will allow Councilwoman Kelly to make a valid conclusion about whether residents of her district support the proposed plan?

• Ask 200 residents of her district whose names are chosen at random.

• Ask 200 parents at the local playground.

Tasty Treats Baking Company asked a random sample of 100

students in the senior class at Ridgemont High School the question, “Do you prefer chocolate or butterscotch Tasty Treats?” Everyone surveyed had to pick one of the two answers, and 42% said they preferred chocolate.

• About 42% of all students at Ridgemont High prefer chocolate.

• About 42% of all students in the senior class at Ridgemont High prefer chocolate.

• 42% of this sample preferred chocolate, but we cannot conclude anything about the population.

Wholesome Food Company asked all students on the baseball team at Ridgemont High School the question, “Do you like broccoli?” and 15% answered “Yes.”

Based on this data, which of the following conclusions are valid?

Choose 1 answer:

• 15% of all students at Ridgemont High like broccoli.

• 15% of all students on the baseball team at Ridgemont High like broccoli.

• 15% of the outfielders on the baseball team like broccoli, but we cannot conclude anything about the population.

Nayara wants to know the percentage of each grade level of students at her school who drive to school. She has 4 grade levels in her school.

Which of the following survey methods will allow Nayara to make a valid conclusion about what percentage of each grade level of students drive to school?

Choose 1 answer:

• Randomly select 48 students who drive to school and ask them their grade level.

• Randomly select 12 students from each grade level and ask whether they drive to school.

Ron intends to survey spectators at the Quidditch World Championship to find out which team the most spectators support.

Which of the following survey methods will allow Ron to make a valid conclusion about which team the most spectators support?

Choose 1 answer:

• Put the names of all of the spectators who speak the same language as Ron does into a cauldron, mix them up, draw out 75 names, and survey those spectators.

• Put the names of all of the spectators into a cauldron, mix them up, draw out 75 names, and survey those spectators.

The entertainment committee at Maplecrest Junior High School has narrowed down the theme of the Spring Dance to three choices. The ten committee members want to conduct a survey to determine which theme Maplecrest's 2000 students prefer. There will be three choices (Disco Fever, The Crazy Eighties, or Hip Hop Til You Drop) and the committee will go with the theme that gets the most votes.

Which of the following survey methods will allow the committee to make a valid conclusion about which theme Maplecrest's student body prefers?

Choose 1 answer:

• Each of the 10 committee members can ask 10 friends to obtain a sample of 100 students.

• Assign a number to each student, and use a computer program to generate 100 random numbers between 1 and 2000. Ask those students whose numbers are selected.

Santos wants to know what percentage of people who get married in his county knew each other in school.

Which of the following survey methods will allow Santos to make a valid conclusion about the percentage of couples married in his county who knew each other in school?

Choose 1 answer:

• Get a list of the 30 couples most recently married in his county, then ask them.

• Sort a list of couples married in his county into a random order, then ask the first 30 couples on the list.

Lincoln Junior High School asked all of their eighth grade students the question, “What is your favorite breakfast?” and 18% answered “pancakes.”

Based on this data, which of the following conclusions are valid?

Choose 1 answer:

• 18% of all students in the eighth grade at Lincoln Junior High School have pancakes as their favorite breakfast, but we cannot conclude anything about the percent of the population who have breakfast as their favorite meal.

• 18% of all students in the eighth grade at Lincoln Junior High School have breakfast as their favorite meal.

• 18% of all students at Lincoln Junior High School have breakfast as their favorite meal.

A large random sample of American students in seventh grade showed that 20% of them were reading below grade level.

Based on this data, which of the following conclusions are valid?

Choose 1 answer:

• About 20% of all American students in seventh grade were reading below grade level.

• 20% percent of this sample was reading below grade level, but we cannot conclude anything about the population.

• About 20% of all American students were reading below grade level.

The library is trying to decide which book to feature in next month's young adult book club, Salt to the Sea or The Sun is Also a Star.

Which of the following survey methods will allow the library to make a valid conclusion about which book the young adults who use their library would prefer?

Choose 1 answer:

• Ask 120 randomly selected people from a list of all young adults registered to the library.

• Ask 120 randomly selected people from a list of all people registered to the library.