Biased or Unbiased?
Why is the sample not reliable?
Finding Percentages
Using Proportions to Find Populations
Random
100
A survey conducted at Southeast Whitfield asked every 4th person who their favorite high school soccer team is.
Biased
100
People at a cookie store were asked what their favorite type of dessert is.
Because people at a cookie store are likely to say that their favorite type of dessert is a cookie.
100
A survey found that 6 out of every 10 people said their favorite color is blue. Find the percentage of people who picked blue as their favorite color.
60%
100
There are 500 players that sign up for baseball in Whitfield County. A random sample of 25 players contains 12 that need a size small uniform. Using the sample, predict how many of the players will need a size small.
240 size smalls
100
-382 times 16
-6,112
200
The editor of the New York Times wants to know what the most popular column in the newspaper is. He decides to send a survey to every reader of the newspaper.
Unbiased
200
A middle school wants to see what the students' favorite snacks are. Every 3rd boy is asked which snack he would prefer.
They only asked boys.
200
A survey found that 6 out of every 10 people said their favorite color is blue. Find the percentage of people who did NOT pick blue as their favorite color.
40%
200
Eastbrook Middle School has 700 students. Out of a sample of 30 students, 18 said that they have pets at home. Use this sample to predict how many students at EMS have pets.
420
200

A sample in which each individual or object in the population has an equal chance of being selected.

Random Sample

300
Ana asked every 5th person at the mall what their favorite movie is.
Unbiased
300
Dr. Willard wants to see if the students think the school rules are fair. He surveys every student that is in ISS.
These students are in trouble, therefore, they probably do not like the rules.
300
24 out of 30 students had a passing math grade on their last report card. What percentage of students did NOT have a passing grade?
20%
300
The school band has to sell sweatshirts at a fundraiser. A survey shows that 2 out of 8 students in the school would purchase a sweatshirt. If there are 900 students in the school, predict how many students would buy a sweatshirt. Will the band sell all of the sweatshirts?
225
300

Mr. Pryor's college was....

Carson Newman University

400
The principal of a high school is trying to decided if the 9th grade math classes are too easy. He gives a survey to students in the 9th grade advanced math classes.
Biased
400
Children under 10 years old were given a survey to determine Dalton's most popular movie.
They are very likely to only pick children's movies.
400
There are 33,000 residents in Dalton, GA. A survey is conducted to determine the town's most popular Mexican restaurant. Out of a sample of 120 people, 42 picked Tijuana's as their favorite. What percentage of people picked Tijuana's as their favorite Mexican restaurant?
35%
400
2,000 people visit Wal-Mart in Dalton each day. Throughout the day, a survey was given to a random sample of 100 people. Out of the 100, 23 people said that they prefer Garnier Fructis over other shampoos. Using the sample, predict how many daily Wal-Mart visitors prefer Garnier Fructis.
460 people
400

Find the mean, median, range, and mode for the following. 12, 4, 8, 10, 4, 16, 4, 12, 24

Mean- 10.44 Median- 10 Range- 20 Mode- 4

500
Every 3rd person that comes out of a play is asked how well they like it.
Unbiased
500
The editor of the New York Times wants to know what the most popular column in the newspaper is. He decides to send a survey to every subscriber of the newspaper.
He should send it to all readers, not just subscribers.
500
There are 33,000 residents in Dalton, GA. A survey is conducted to determine the town's most popular Mexican restaurant. Out of a sample of 120 people, 42 picked Tijuana's as their favorite. What percentage of people did NOT pick Tijuana's as their favorite Mexican restaurant?
65%
500
12,500 people visit Wal-Mart each day. A sample of 120 people were selected to take a survey. 92 out of the 120 customers said that they bought a loaf of bread. Using this sample, predict how many people at Wal-Mart buy bread daily. (Round to the nearest whole person)
9,583 people
500

Find the Mean Absolute Deviation (MAD) of the numbers below. WORTH DOUBLE!!

6, 7, 2, 1, 8, 10

2.8

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