Make valid claims, Identify Population and sample

Make valid claims, Identify Population and sample (practice questions)

Deciding if a sampling method (or how you acquired your data) is appropriate to your study

When you are collecting data for your survey you need to make sure you keep these things in mind.

• Is my sample a truly random sample? Am I hearing from as many parts of the population as possible?

•  Is there anything that will skew my data?

• Am I alienating any one or leaving out any particular group of individuals?

Poll

Sally wants to conduct a survey of her 300 class mates to determine which candidate for class president. Joseph or Rachel. Will win the upcoming election

Sally will ask the question, " if the election were today which candidate would get your vote?

Which of the following methods for surveying her class would allow Sally to make a Valid Conclusion about who might win the election?

• Ask all the students at joseph's Lunch table

• Ask all the Students on Rachel's Soccer team

• Put the students names in a hat and draw 50 names at random and go interview those people

• Ask every student who has a 4.0 GPA

Multiple Choice

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

Multiple Choice

Wholesome Food Company has been hired to design a healthy menu for the cafeteria at Ridgemont High School. They want to conduct a survey to determine what percentage of Ridgemont’s 1500

students like broccoli. The survey will ask, “Do you 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.

Multiple Choice

The curriculum committee at Alden Conger High School wants to offer a new elective course next year. They decide to survey Alden's 300

students to determine which course students would prefer. The choices are History of Art, Robotics, and Money and History of Video games

Which of the following survey methods will allow the committee to make a valid conclusion about which course the students at Larchmont prefer?

• Ask 150 Students in Science class which course they would prefer

• Ask only Students who are only on student console

• Have a computer randomly generate a list of 150 Students and interview them

• Ask Mr. Shanks and Mr.Ragatz

Sample or Population?

SAmple vs Population

• Sample: Is a subset of your population

• Population: Consists of all (human or other wise) that are being Studied

Multiple Choice

Complete the definition:

A _______ is a subset of a population

• sample

• sampel

• people

• statistics

• group

Multiple Choice

Complete the definition:

A _________ consists of all subjects (human or otherwise) that are being studied

• Statistics

• Number

• People

• Population

• Pueblo

Multiple Choice

A student at Alden Conger wants to know what other students thoughts are on school lunches. Which of the following would be a population?

• All the students in the united states

• all the students at alden conger

• Every student in Minnesota

Multiple Choice

A musician wanted to see what people who bought his last album thought about the songs.

Which choice best represents a sample?

• Every person who bought the album.

• A selection of people who didn't want to buy the album.

• 250 girls who bought the album.

• A selection of 3,294 people who bought the album.

Multiple Choice

A beverage company wanted to see if people in the United States liked their new logo.
Which choice best represents a population?

• A selection of logo artists.
• Every person in the United States.
• A selection of shoppers from different shoppers from different states.
• 3,800 children age 5-15

Multiple Choice

Population or Sample?

A recent survey of 2625 elementary school children found that 28% of the children could be classified obese.

• Population

• Sample

Multiple Choice

Population or Sample?

Every fifth customer exiting a restaurant is surveyed on how well they liked the food.

• Population

• Sample

Multiple Choice

Population or Sample?

A survey of 1353 American households found that 18% of the households own a computer.

• Population

• Sample

Multiple Choice

Population or Sample?

The average weight of every person entering the mall within 3 hour period was 146 lb.

• Population

• Sample

*Making valid claims about your the results of your survey (what you can and cant say)

Making Claims about the results of your study

• Make sure you are specific as possible

• Only talk within the parameters of your study (do not apply it to everybody!)

• You can only make a claim about your population if your experiment was a random sample! or if you sampled everyone in your population!

Multiple Choice

A student at alden conger did a survey asking students how many hours of sleep do they get each night. The studnet used a large random sample and found that 28% of those he survey said they get "at least 5 hours of sleep every night" which of the following statements can be made about the population?

• 28% of all students get at least 5 hours of sleep every night

• 28% of students at Alden conger get at least 5 hours of sleep every night

Multiple Choice

A large random sample of American students in seventh grade showed that 20 percent

of them were reading below grade level.

Which of the following conclusions are valid?

• about 20% of all American Students in seventh grade were reading below grade level

• 20% 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

Multiple Choice

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

which of the following conclusions are valid?

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

• b. 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

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

Multiple Choice

Tasty Treats Baking Company asked all 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 % percent

said they preferred chocolate.

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

• 42% percent

  of all students at Ridgemont High prefer chocolate.

• 42% percent

  of all students in the senior class at Ridgemont High prefer chocolate

• 42% percent

  of the male students in the senior class at Ridgemont High prefer chocolate, but we cannot conclude anything about the population.