Khan Academy: Valid Claims Practice
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Questions and Answers

Based on the survey, which of the following conclusions are valid?

  • 15% of all students on the baseball team at Ridgemont High like broccoli. (correct)
  • 15% of the outfielders on the baseball team like broccoli, but we cannot conclude anything about the population.
  • 15% of all students at Ridgemont High like broccoli.

    • Which of the following survey methods will allow Wholesome Food Company to make a valid conclusion about the percentage of students at Ridgemont that like broccoli?

  • Ask 100 students in line at the salad bar during lunchtime for one week.
  • Assign a number to each student, and use a computer program to generate 100 different random numbers between 1 and 1500. Ask those students whose numbers are selected. (correct)

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

  • About 67% of all students at Ridgemont High prefer pizza for lunch. (correct)
  • About 67% of all teenagers prefer pizza for lunch.
  • 67% of the students in the sample prefer pizza for lunch, but we cannot conclude anything about the population.

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

    <p>Randomly select 12 students from each grade level and ask whether they drive to school.</p> Signup and view all the answers

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

    <p>15% of all students in grade 6 at HACS are below level in math.</p> Signup and view all the answers

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

    <p>80% of the classmates in this sample may tell their dreams, but we cannot conclude anything about the population.</p> Signup and view all the answers

    Which of the following survey methods will allow Bella to make a valid conclusion about the percentage of residents of Forks that believe in supernatural creatures?

    <p>Ask a randomly selected sample of residents to answer the question anonymously.</p> Signup and view all the answers

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

    <p>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.</p> Signup and view all the answers

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

    <p>About 55% of all Sweet Treats customers prefer Mango.</p> Signup and view all the answers

    Which of the following methods of surveying his classmates will allow Ross to make valid conclusions about which candidate is in the lead?

    <p>Put the names of all the students in a hat, and draw 50 names. Ask those students whose names are drawn.</p> Signup and view all the answers

    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?

    <p>Sort a list of couples married in his county into a random order, then ask the first 30 couples on the list.</p> Signup and view all the answers

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

    <p>60% of customers in this sample are satisfied, but we cannot conclude anything about the population.</p> Signup and view all the answers

    Which survey method will allow the drama teacher to make a valid conclusion about which genre of performance more families would attend?

    <p>Assign a number to each family, use a computer program to select 20 random numbers between 1 and the total number of families, and ask the families selected.</p> Signup and view all the answers

    Study Notes

    Valid Claims and Survey Methods

    • Wholesome Food Company surveyed Ridgemont High baseball players on broccoli preference; 15% responded positively.

    • Conclusion: 15% of all baseball players at Ridgemont High like broccoli, not of all students.

    • For an accurate survey about broccoli preference at Ridgemont's 1500 students, a random selection method is preferred.

    • Using a computer to randomly select students ensures fair representation, unlike surveying only students at the salad bar.

    • Good Taste Food Company found that 67% of 100 randomly chosen Ridgemont students prefer pizza.

    • Conclusion: Approximately 67% of Ridgemont High students prefer pizza, reflecting general preference.

    • Nayara wants to assess driving habits among students across four grade levels.

    • Valid method: Randomly selecting an equal number (12) of students from each grade level provides balanced results.

    • At High Achievers Charter School, 15% of sixth graders were identified as below grade level in math based on comprehensive testing.

    • Conclusion: 15% of all sixth graders at HACS are below grade level.

    • Jonas learns about a specific rule regarding dreams, asking a sample of classmates.

    • Conclusion reflects that 80% of the sample says they can share their dreams, but it doesn't indicate general class permission.

    • Bella's survey on Forks residents' beliefs in supernatural creatures needs randomness.

    • Asking a randomly selected sample of adult residents provides valid conclusions about the community’s beliefs.

    • Lincoln Junior High found that 18% of eighth graders favor pancakes for breakfast.

    • Conclusion indicates this preference within the eighth grade but doesn’t apply to all breakfast choices.

    • Sweet Treats candy company surveyed customer preferences for jelly bean flavors among 100 participants.

    • Conclusion: About 55% of Sweet Treats customers prefer Mango jelly beans.

    • Ross seeks to know which treasurer candidate leads among 400 classmates.

    • A random selection method, drawing names from a hat, ensures unbiased sampling for valid results.

    • Santos explores the percentage of couples who knew each other in school; random selection is crucial.

    • Sorting and asking the first randomly ordered couples produces better results than selecting the most recent 30.

    • The Read and Feed restaurant collected 150 customer surveys to assess satisfaction.

    • Conclusion: Results indicate satisfaction only represents the sample, not all customers.

    • The drama teacher aims to find out which performance genre families prefer.

    • Effective method involves assigning numbers to all families and randomly selecting to ensure varied representation.

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    Quiz Team

    Description

    This quiz focuses on understanding valid and invalid claims based on survey data. By analyzing a specific scenario at Ridgemont High School, participants will learn how to assess conclusions drawn from partial data.

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