Unit 5 B Statistics Lesson 2 Unbiased and

Unit 5 B Statistics Lesson 2 Unbiased and Biased Samples

Lesson 2: Unbiased and Biased Samples Objective: Swbat determine whether sampling methods are valid. Do Now:

Lesson 2: Unbiased and Biased Samples Definitions Unbiased Sample is selected so that it accurately represents the entire population. - Simple Random Sample is each item as likely to be chosen than the other. - Systematic Random Sample is when items are selected according to a specific time. Biased Sample is when one or more parts of the population is favored. - Convenience Sample consists of members of a population that are easily accessed. - Voluntary Response Sample involves only those who want to participate in the sampling.

Lesson 2: Unbiased and Biased Samples Determine if unbiased or biased and type. A random sample of students at a Middle School shows that 10 students prefer listening to rock, 15 students prefer listening to hip hop, and 25 students prefer no music while they exercise.

Lesson 2: Unbiased and Biased Samples Determine if unbiased or biased and type. A random sample of students at a Middle School shows that 10 students prefer listening to rock, 15 students prefer listening to hip hop, and 25 students prefer no music while they exercise. (Unbiased, simple random sample)

Lesson 2: Unbiased and Biased Samples Determine if unbiased or biased and type. Every tenth person who walks into a department store is surveyed to determine his or her music preference. Out of 150 customers, 70 stated that they prefer rock music.

Lesson 2: Unbiased and Biased Samples Determine if unbiased or biased and type. Every tenth person who walks into a department store is surveyed to determine his or her music preference. Out of 150 customers, 70 stated that they prefer rock music. (Unbiased, Systematic Random Sample)

Lesson 2: Unbiased and Biased Samples Determine if unbiased or biased and type. The customers of a music store are surveyed to determine their favorite leisure time activity. 85% said listening to music, 6% said sports and 9% said other.

Lesson 2: Unbiased and Biased Samples Determine if unbiased or biased and type. The customers of a music store are surveyed to determine their favorite leisure time activity. 85% said listening to music, 6% said sports and 9% said other. (Biased, Convenience Sample)

Lesson 2: Unbiased and Biased Samples Determine if unbiased or biased and type. A radio station asks its listeners to indicate their preference for one or two candidates in an upcoming election. 72% of the listeners who responded preferred Candidate A, so the radio station announced Candidate A would win the election.

Lesson 2: Unbiased and Biased Samples Determine if unbiased or biased and type. A radio station asks its listeners to indicate their preference for one or two candidates in an upcoming election. 72% of the listeners who responded preferred Candidate A, so the radio station announced Candidate A would win the election. (Biased, Voluntary Response Sample)

Classwork Guided Practice #1 – 3 Independent Practice #1 – 4 Problem Solving Practice #1 - 6

Closure Question: What are the types of unbiased and biased samples? Exit Ticket Homework: Practice #1 - 5

Exit Ticket Name one type of biased sample and explain the bias.

Homework