Random Sampling
Five Number Summaries
Mean, Median, Mode, Range, Mean Absolute Deviation
Biased/Unbiased Sampling
Dot Plots
100
Taraji wants to do a survey on what lip gloss the girls in the school like best. She decides she will write down every girl in the school's name and draw 30 names out of a hat to ask.
Would this be a random sample? Why or why not?
Yes, because she is choosing them randomly, so everyone has equal chances of choosing something different.
100
Find the 5 number summary for the data:
42, 58, 67, 55, 40, 69, 66, 51, 46, 48, 68
Min: 40
Q1: 46
Q2: 55
Q3: 67
Max: 69
100
Find the mean, median, mode, range, and mean absolute deviation for the data:
9, 4, 9, 6, 2
Mean: 6
Median: 6
Mode: 9
Range: 7
M.A.D: 2.4
100
Bentley and DeMichael want to survey how much the boys on the soccer team like soccer on a scale from 1-10. They decide they will ask the boys on the team who get 35+ min of play time each game.
Would this be biased or unbiased sampling, and why?
This would be biased. The boys who play more probably like soccer more.
100
Draw a dot plot with the data below:
3, 2, 9, 9, 3, 1, 4, 2, 3
2 dots above 9
1 dot above 4
3 dots above 3
2 dots above 2
1 dot above 1
200
Ahryous wants to find out what shoes everyone in the school can afford. He decides he is going to ask his 12 best friends which ones they can afford.
Would this be a random sample? Why or why not?
It would not be random, because he is only asking his friends which wouldn't give a wide variety of students in the school.
200
Find the 5 number summary for the data:
14, 11, 8, 1, 23, 20, 17, 5, 19, 10, 12, 22
Min: 1
Q1: 9
Q2: 13
Q3: 19.5
Max: 23
200
Find the mean, median, mode, range, and mean absolute deviation for the data:
4, 3, 7, 7, 7, 6, 7, 2, 2
Mean: 5
Median: 6
Mode: 7
Range: 5
M.A.D: 2
200
James wants to see how many 3 pointers the boys at the school can shoot in a minute. He decides he will have every boy whose last name starts with an "S" go to the gym and try it.
Would this be biased or unbiased sampling, and why?
This would be unbiased sampling, because the letter that their last name starts with does not affect how good they are at shooting 3 pointers.
200
Find the mode of the data
8 & 10
300
Gavin wants to find out his class's favorite candy. He chooses to only ask the kids in his class who are wearing Nike's.
Is this an example of random sampling? Why or why not?
This is an example of random sampling, because even though he is only asking the kids with Nike's, their shoe preference doesn't relate to the candy they prefer.
300
Find the 5 number summary for the data:
107, 92, 111, 119, 99, 100, 89, 94, 125, 93
Min: 89
Q1: 93
Q2: 99.5
Q3: 111
Max: 125
300
Find the mean, median, mode, range, and mean absolute deviation for the data:
3, 9, 2, 6, 7, 9
Mean: 6
Median: 6.5
Mode: 9
Range: 7
M.A.D: 2.3
300
Saniyah wants to see what the girls in the school's favorite style of Ugg is. She decides she will only ask the girls who wear glasses her question.
Is this biased or unbiased sampling, and why?
Unbiased, because the fact that they wear glasses doesn't affect their favorite shoe style.
300
Find the range of the data
7
400
Chandler wants to know everyone in the school's favorite computer game. He decides to ask every 7th kid who walks into the building what their favorite computer game is.
Would this be an example of random sampling? Why or why not?
This would be random, because the order they come into the school is random, and the order they come into the school doesn't affect their favorite computer game.
400
Find the 5 number summary for the data:
72, 60, 64, 75, 79, 63, 70, 61, 78
Min: 60
Q1: 62
Q2: 70
Q3: 76.5
Max: 79
400
Find the mean, median, mode, range, and mean absolute deviation for the data:
2, 5, 3, 8, 4, 6, 7, 4, 8, 3
Mean: 5
Median: 4.5
Mode: 3, 4, 8
Range: 6
M.A.D: 1.8
400
Natalie wants to find out what her classmate favorite dog breed is. She decides she will only ask people whose dog weighs over 50 pounds what their favorite is.
Is this biased or unbiased sampling, and why?
This is biased, because these people are more likely to choose big dog breeds over smaller breeds.
400
Find the median of the data
10
500
Trinity wants to find out which stunt is the cheer squad's favorite. She decides to only ask all of the 7th graders their favorite stunt.
Is this an example of random sampling? Why or why not?
This is NOT an example of random sampling. The 7th graders may favor a stunt from last year that the 6th graders never did, or they may not have done some stunts that the 8th graders have.
500
Find the 5 number summary for the data:
134, 47, 122, 113, 49, 56, 102, 93, 62
Min: 47
Q1: 52.5
Q2: 93
Q3: 117.5
Max: 134
500
Find the mean, median, mode, range, and mean absolute deviation for the data:
3, 8, 9, 2, 4, 5, 8, 2, 6, 3
Mean: 5
Median: 4.5
Mode: 2, 3, 8
Range: 7
M.A.D: 2.2
500
Elius wants to find out what everyone in the school's favorite basketball team is. He decides to just ask the basketball players who their favorite is.
Would this be biased or unbiased sampling, and why?
This would be biased, because the basketball team would be more likely to choose a good team, and Elius wouldn't be surveying any girls.
500
Find the mean of the data
10.3