Generating Random Samples

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Presentation transcript:

Generating Random Samples

Warm Up A manager samples the receipts of every fifth person who goes through the line. Out of 50 people, 4 had a mispriced item. If 600 people go to this store each day, how many people would you expect to have a mispriced item? Jerry randomly selects 20 boxes of crayons from the shelf and finds 2 boxes with at least one broken crayon. If the shelf holds 130 boxes, how many would you expect to have at least one broken crayon?

Each of the 200 students in a school will have a chance to vote on one of two names, Tigers or Bears, for the school’s athletic teams. A group of students decides to select a random sample of 20 students and ask them for which name they intend to vote. How can the group choose a random sample to represent the entire population of 200 students? Of the 20 students surveyed, 9 chose Tigers. What was the percent choosing Tigers. What might the group infer?

A tree farm has a 100 acre square field arranged in a 10-by-10 array A tree farm has a 100 acre square field arranged in a 10-by-10 array. The farmer wants to know the average number of trees per acre. Each cell in the table represents an acre. The number in each cell represents the number of trees on that acre.

To simulate the random selection, number the table columns 1–10 from left to right, and the rows 1–10 from top to bottom. Write the numbers 1-10 on identical pieces of paper. Place the pieces into a bag. Draw one at random, replace it, and draw another. Let the first number represent a table column, and the second represent a row. For instance, a draw of 2 and then 3 represents the cell in the second column and third row of the table, an acre containing 54 trees. Repeat this process 9 more times.

Based on your sample, predict the average number of trees per acre Based on your sample, predict the average number of trees per acre. How does your answer compare with the actual mean number, 48.4? Suppose that you use this method to collect a random sample of 25 acres. Do you think any resulting prediction would be more or less reliable than your original one? Explain.