Show:
Sample
Population
Proportions
Mean/Median/IQR/MAD
Center/Spread/Shape
100

what is a sample

a smaller group of the population you are wanting to study
100

what is a population

the group you are wanting to study


100

what is a proportion

is a way to show how much of something there is compared to the whole


100

what is mean and median? 

Mean is the average

Median is the middle number


100

what is shape? what is center? and what is spread?

Shape: what a distribution looks like (symmetric, right and left skewed) 

Center: tells us what a "typical" value looks like (mean, median) 

Spread: how far apart the numbers are (range) 

200

explain why it is better to use a sample instead of surveying the entire population

it saves time, money and effort while still giving a good estimate 


200

the basketball coach wants to find out how many players get at least 8 hours of sleep. She surveys the varsity team. What is the population? 

all players on the varsity basketball team 

200
Liam read 12 pages in 15 minutes. How many pages can he read in 45 minutes? 

36 pages. or 36/45

200

what is mad? 

mean absolute deviation

a way to measure how spread out the data is around the mean 

200

How do you find range? 

Find it for this data set 

25, 34, 20, 19, 29, 23, 30, 31

range = largest - smallest number 

34-19 = 15

300
a school wants to know how man students are happy with the cafeteria food. They survey 40 students from each grade level. is this a good sample? Why or why not? 

yes, because it includes students from all grade levels and is likely to represent the whole school


300

a fitness app company analyzes step data from 2,000 randomly selected users over a 3 month period to improve its exercise recommendations. What is the population? 

all users of the fitness app 


300

what is the formula we use to determine a proportion? 

members of a sample with attribute/ total sample size 


300

what numbers does the 5# summary consist of? 

minimum, Q1, median, Q3, maximum 

300

what measure of center do I use if my data is skewed? 

median


400

your principal wants to know what after- school clubs students are interested in. She surveys only students in the art club. What would make this sample better? 

survey students from many different clubs or randomly selected students from the whole school

400

a professor surveys 100 college students to learn about student debt and financial stress. What is the population the professor wants to understand? 

all college students in the US 

400

in a group of 40 students, 10 choose mint chocolate chip as their favourite. Estimate how many out of 100 students might choose mint chocolate chip? 

25/100 students 

400

What are the 5 steps to find IQR? 

find it for this data set 

55, 62, 78, 90, 35, 21, 62, 89 

1. put your data in order 

2. find the median 

3. split your data into the lower and upper half 

4. find the middle number of those halves

5. subtract Q3 from Q1 

IQR = 38.5! 

400
if your data is a symmetric distribution what does this tell us about our mean and median?

they are about the same 

500

you estimate the 60% of students like basketball. You got this from a sample of 5 people. Your friend estimates this might not be accurate. Who is right and why? 

your friend is right - 5 people is not enough 

500

a health organization sends surveys to 300 fast food customers who made purchases on a Monday. What is the population? 

all fast food customers on mondays

500

Out of 30 students, 18 said they watched a movie last weekend? Estimate how many out 90 students probably did too. 

54/90 students

500

find the mad 

32, 43, 56, 87, 30, 63, 55 

mad = 14.75

500

what is a good example of data that would be skewed left. (most data is on the higher end with some data on the lower end) 

retirement ages