Lesson 16: Methods for Selecting a Random Sample In this lesson, you will obtain random numbers to select a random sample. You will also design a plan.

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Presentation transcript:

Lesson 16: Methods for Selecting a Random Sample In this lesson, you will obtain random numbers to select a random sample. You will also design a plan for selecting a random sample to answer a statistical question about a population.

Example 1: Sampling Children’s Books What is the longest book you have ever read? The Hobbit has 95,022 words and The Cat in the Hat has 830 words. Popular books vary in the number of words they have—not just the number of different words, but the total number of words. The table below shows the total number of words in some of those books. The histogram displays the total number of words in 150 best-selling children’s books with fewer than 100,000 words.

Exercises 1–2 1.From the table, choose two books with which you are familiar and describe their locations in the data distribution shown in the histogram. 2.Put dots on the number line below that you think would represent a random sample of size 10 from the number of words distribution above.

Example 2: Using Random Numbers to Select a Sample The histogram indicates the differences in the number of words in the collection of 150 books. How many words are typical for a best-selling children’s book? Answering this question would involve collecting data, and there would be variability in that data. This makes the question a statistical question. Think about the 150 books used to create the histogram above as a population. How would you go about collecting data to determine the typical number of words for the books in this population? 2.How would you choose a random sample from the collection of 150 books discussed in this lesson?

Exercises 3–6 3. Follow your teacher’s instructions to generate a set of 10 random numbers. Find the total number of words corresponding to each book identified by your random numbers

4. Choose two more different random samples of size 10 from the data and make a dot plot of each of the three samples.

5. If your teacher randomly chooses 10 books from your summer vacation reading list, would you be likely to get many books with a lot of words? Explain your thinking using statistical terms. 6. If you were to compare your samples to your classmates’ samples, do you think your answer to Exercise 5 would change? Why or why not?

8. Berthio’s class decided to measure balance by finding out how long people can stand on one foot. a.How would you rephrase the question above to create a statistical question using this definition of balance? Explain your reasoning. b.What should the class think about to be consistent in how they collect the data if they actually have people stand on one foot and measure the time?

Lesson Summary In this lesson, you collected data on total number of words by selecting a random sample of children’s books. You also observed that several different samples of the same size had some characteristics in common with each other and with the population. In the second activity, you designed a statistical study. First, you considered a statistical question. Then, you went through the statistical process beginning with the question, and then thinking about how to choose a random sample, how students would take part, what data you would collect to answer the question, and how you would display and analyze the data.

Problem Set 1.The suggestions below for how to choose a random sample of students at your school were made and vetoed. Explain why you think each was vetoed. a.Use every fifth person you see in the hallway before class starts. b.Use all of the students taking math the same time as your class meets. c.Have students who come to school early do the activity before school starts. d.Have everyone in the class find two friends to be in the sample. 2.A teacher decided to collect homework from a random sample of her students, rather than grading every paper every day. a.Describe how she might choose a random sample of five students from her class of 35 students. b.Suppose every day for 75 days throughout an entire semester she chooses a random sample of five students. Do you think some students will never get selected? Why or why not? 3.Think back to earlier lessons in which you chose a random sample. Describe how you could have used a random-number generator to select a random sample in each case. a.A random sample of the words in the poem “Casey at the Bat” b.A random sample of the grocery prices on a weekly flyer.