Question

1.you want to know what the 7th grade students think of their science class. you poll 100 random 7th graders. biased or unbiased? why?

1. a hip - hop radio station wants to know what type of music is the most popular. they ask their listeners to call in and select their favorite type of music. biased or unbiased? why?

1. you ask 50 people in your local grocery store which grocery store is their favorite. biased or unbiased? why?

1. you want to know which store shoppers at the mall visit the most. you ask each 10th person as they enter the mall which store they will visit. biased or unbiased? why?

1. kiki wants to know which brand of athletic shoe is most popular with the students at her school. which survey plan results in a random unbiased sample?

a. survey only her friends
b. survey the students in her science class
c. survey the students as they enter the school
d. survey the students at the local shoe store

1. you want to know which mall store shoppers visit the most. which would represent a random unbiased sample?

a. survey every 10th person that enters the mall
b. survey the shoppers under 21 years of age
c. survey the shoppers of a toy store
d. survey every 10th students at your school

Explanation:

Question 1

Polling 100 random 7th - graders gives a representative sample of the target population (all 7th - grade students) as there's no inherent bias in randomly selecting from the group we want to study.

Question 2

The radio station is only asking its own listeners, who are already likely to be hip - hop fans. This sample is not representative of all people who have a preference for different types of music.

Question 3

Asking people in your local grocery store about their favorite grocery store will likely result in a sample that is over - represented by people who already like that particular grocery store (since they are shopping there). It doesn't represent the preferences of all people who could have a favorite grocery store.

Question 4

Answer:

Unbiased.