N.8

Populations, Samples & Bias

Name the population and the sample of a survey, and tell whether a sample is likely to be biased.

Level

Medium

Level

Problems

Show exampleInclude answer key

@page { size: letter; margin: 0; } @media print { .ws-page + .ws-page { break-before: page; } } Daniel Math Academy \cdot Grade 7 Math Populations, Samples & Bias Skill N.8 \cdot Statistics & sampling \cdot ★★☆ Medium Name Date Score / 4 Scan for answers Answer each question. Example Asking the cooking club for the school's favorite lunch: biased Think: A sample is biased when some members of the population are more likely to be in it than others. Picking at random from the whole population gives an unbiased sample. 1 To find the favorite lunch of the students at a school, Sam surveys the 20 students in the cooking club. Is the sample biased or unbiased? 2 To find the favorite type of book at a school, the librarian asks every tenth student who walks into the cafeteria. Is the sample biased or unbiased? 3 To learn how long students spend on homework, a teacher asks the students who stay after school in the homework club. Is the sample biased or unbiased? 4 To find out what pet is most common in a town, Ana asks 80 people at the town's dog park. Is the sample biased or unbiased? Daniel Math Academy \cdot danielmath.com Worksheet # 94n3rft \cdot Page 1 / 2 Daniel Math Academy \cdot Grade 7 Math Answer Key N.8 Populations, Samples & Bias \cdot ★★☆ Medium 1 biased 2 unbiased 3 biased 4 biased Daniel Math Academy \cdot danielmath.com Worksheet # 94n3rft \cdot Answer Key \cdot Page 2 / 2

N. Statistics & sampling9 skills