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Identifying Random and Bias Data Samples

Answer Keys Here

Aligned To Common Core Standard:

High School Statistics - HSS-IC.A.1

How to Identify Random and Bias Data Samples - When carrying out statistical research, the most important thing is to take a look at the types of samples used in the research. The first and foremost thing is to ensure that your survey is taken seriously and the samples of the survey are reliable. In order to identify the survey samples, all you have to do is identify the types. Let's guide you to identify random and bias samples from a survey. Random sample: - Let's think about it this way. Can you easily represent a true picture of a survey that you know nothing about? Where would you start? How would you go about it? The best in such a case is random samples. As the name implies, they are just random. In collecting random samples, the collector gathers all the data in a big database program that chooses a certain number or certain people at a random number. Bias sample: - Bias sampling refers to samples that are particularly selected to conduct the study. They are not chosen randomly from a survey, in fact, chosen deliberately. Bias samples do not represent the true representation of a survey. These worksheets and lessons help students be able to breakdown samples of data and be able to identify random data or any bias that may exist in or towards a data set.

Printable Worksheets And Lessons

Homework Sheets

We look for bias in situational word problems and identifying data sampling techniques.

  • Homework 1 - A marketing study of the population that live within a 25 mile radius of Toronto was being conducted. All of the people have an annual income between $5,000 to $30,000 and have completed 10 years of school.
  • Homework 2 - Where would you mostly likely receive a biased response to the following question?
  • Homework 3 - An electronics firm recently introduced a music system and conducted a survey among 300 buyers randomly selecting them proportional to satisfied customers. Classify the sampling method?

Practice Worksheets

As you can probably tell, I had some real fun putting these together.

  • Practice 1 - Westville High School had to choose a mascot for their school. Mrs. Davis class was asked to setup a survey to find out if students preferred a duck or a cow as their school mascot. She had 5 teams of students conduct surveys.
  • Practice 2 - Are the following conclusions drawn from a sample or a general population?
  • Practice 3 - The city council would like to hear two different options for polling the city. Describe how you would setup a poll for the city using each of the following sampling techniques. Also describe the pros and cons of each technique so the council can choose the best for them.

Math Skill Quizzes

I didn't want to over do it on the same concepts. I'm working on a third quiz that is different, now.

  • Quiz 1 - An architect conducted a survey to count defective Marble tiles. He conducted the survey on first 3 floors of the 5 story building. He did not survey people on the 4th floor because he was too tired. Classify the sampling method.
  • Quiz 2 - I chose people among a group of 15 people. Each person was left handed. Is this statement biased?