Knowledge is Power
Vocabulary
Population & Samples
Mean, Median, Mode...
Interpreting Data
100
Biased or Unbaised?
A Lemonade Stand Want to know About how many people get or drink lemonade. So, every person that goes to his stand will be surveyed.
Biased
100
This term refers to the difference between the highest value and the lowest value and you subtract it and get your answered
What is Range?
100
Microsoft wants to know about how much do all of America's families use its technology but it would take years, so they sampled 1000 people.
Who is the population...
All of America's Families
100
FIND THE MEAN: 1234, 1570, 784, 36, 9756
2676
100
The range of Jayden's quiz scores is 20. The range of Riley's quiz scores is 30. What can you infer?
A) Riley does better on quizzes
B) Jayden does better on quizzes
C) Riley's quiz scores are more consistent
D) Jayden's quiz scores are more consistent
What is (D)?
A large range indicates the variance of scores. Jayden's range was smaller, meaning his scores were closer together and more consistent.
200
Liam wants to know how many 7th grade students have their own cell phone. She surveys 40 students, and 32 of them own a cell phone.
If there are 500 7th graders, this is the amount that you would expect to own a cell phone.
What is 400?
200
This term refers to the data that is called the average of that set, to find it you have to find the sum of the data values in a set and divide it by how many numbers there was
What is Mean?
200
Mikey wants to know about how many kids in his grade play board games. So, he surveyed 35 kids in his grade level.
Who is the population...
All of the kids in his grade
200
FIND THE RANGE: 109, 123, 145, 894, 147
785
200
Which of the following is a true statement?
A) Ladybugs tend to be longer
B) Beetles vary more in size
C) All beetles are larger than all ladybugs
D) There were fewer ladybugs in the sample
What is B?
The box plot for Beetles is much larger, indicating a larger variance/spread.
300
Nicholas asks 20 people what their favorite animal is and 5 of those surveyed state that a monkey is their favorite animal.
About how many people will choose a monkey as their favorite animal out of a group of 75?
What is 19 people?
(18.75)
300
This term refers to the score that is found in the middle of a data set.
What is Median?
300
Ava wants to know how much time her friends spend on their phones. So, she randomly surveyed 15 of her friends.
Who is the sample...
The 15 friends she surveyed.
300
FIND THE MEDIAN: 1, 5, 7, 10, 5, 3, 9
5
300
What is the difference in the medians for spring and summer temperatures?
80 - 70 = 10
400
Johannah wants to know what kind of candy to buy for the concession stand. She keeps track of the candy purchased during Tuesday's game. The results are below:
15 chocolate bars
7 Skittles
8 Suckers
5 Twizzlers
How many chocolate bars should they purchase for Friday's game if they anticipate 210 people will come to purchase candy?
90 Chocolate Bars
400
The data score that occurs most often in a data set.
What is Mode?
400
Noah wants to know his math class students average grade in math. So, he randomly surveyed 5 of his classmates.
Who is the population...
All the students in his math class.
400
FIND THE MODE: 4, 2, 7, 5, 1, 8, 4, 2, 6, 9, 3
2 and 4
400
Shan went to one of the above restaurants and purchased a meal for $4.50. This is the restaurant Shan most likely went to.
What is the Red Brick Grill?
500
You want to determine the average cost of a house in Iowa so you survey 5,000 people living in DesMoines and conclude that the average cost of a house in Iowa is $280,000. Is this a valid conclusion? Why or why not?
No - the sample was not representative of the entire state
500
That part of a population that is being studied.
What is Sample?
500
Ashton wants to know how many people spend their time outdoors in his county. So, he sends a survey in the mail to every resident in his county and asks them to complete and return to him.
Who is the sample...
The people who respond to the survey.
500
Find the MAD:
1, 1, 4, 5, 5, 5, 5, 7, 7, 10
1.8
500
Which of the following is true?
A) The restaurants have the same range of prices
B) The meals at Red Brick are more expensive
C) The restaurants have the same median price
D) The restaurants have the same interquartile range of price
What is D?
(Recall: the IQR/interquartile range is Q3-Q1, this it the length of the "box" ) Both restaurants have an IQR of 2.
