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Quiz

STATS 151

Joshua Rutherford 5 Fragen

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  1. 1Suppose a local school district decides to randomly test high school students for their overall
    school experience. There are three high schools in the district, each with grades 9-12. The
    school board pools all of the students together and randomly samples 250 students. Is this a
    simple random sample?
    1. AYes, because each student is equally likely to be chosen.
    2. BYes, because they could have chosen any sample of 250 students from throughout the district.
    3. CNo, because we can’t guarantee that there are students from each school in the .sample.
    4. DNo, because we can’t guarantee that there are students from each grade in the sample.
    5. EThere is not enough info to know whether it is a simple random sample.
  2. 2A random sample of 2000 Canadians were asked to name their favorite fast-food
    restaurant in 2019. ABC Restaurant had the highest percentage with 10% of Canadians
    ranking it as their favorite restaurant. Which is TRUE?
    1. AThe population of interest is all Canadians
    2. B10% is a statistic and not the actual percentage of all Canadians who would rank this restaurant as their favourite.
    3. CThis sampling design should provide a reasonably accurate estimate of the actual percentage of all Canadians who would rank this restaurant as their favourite.
  3. 3Suppose a store owner decides to randomly test the hygiene of his staff. There are 10 departments in his store, and each department has 20 staff members. He plans to test 40 of his staff members by randomly choosing 4 staff members from each department. Is this a simple random sample?
    1. AYes, because the staff members were chosen at random.
    2. BYes, because each staff member is equally likely to be chosen.
    3. CYes, because stratified samples are a type of simple random sample.
    4. DNo, because not all possible groups of 40 staff members could have been the sample. This is a stratified sample.
    5. ENo, because a random sample of departments was not first chosen.
  4. 4Suppose a store owner decides to randomly test the hygiene of his staff. There are 10 departments in his store, and each department has 20 staff members. He plans to test 40 of his staff members by randomly choosing two departments and check everyone in these two departments. Is this cluster sampling?
    1. AYes, because the staff members were chosen at random.
    2. BNo, because each staff member is equally likely to be chosen.
    3. CYes, because cluster samples are a type of simple random sample.
    4. DNo, because not all possible groups of 40 staff members could have been the sample.
    5. EYes, because each department is a cluster, and everyone within the two randomly chosen departments is the sample.
  5. 5A statistics teacher wants to know how her students feel about an introductory statistics course. She decides to administer a survey to a random sample of students taking the course. She has several sampling plans to choose from. Name the sampling strategy in each.

    There are four levels of students taking the class: 1st year, 2nd year, 3rd year, and 4th year.
    Randomly select 15 students from each level.
    [blank_start]Stratified Random Sample[blank_end]
    1. AStratified Random Sample
    2. BSimple Random Sample
    3. CCluster Random Sample
    4. DSystematic Random Sample

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Quiz am STATS 151, erstellt von Joshua Rutherford am 21/09/2021.
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