Vocabulary
This happens to the result/outcome of a study when a "fair" sample is not taken.
What is Bias?
The data that is collected is numbers (either counted or measured).
What is Numerical data?
Find the mode of this set:
3,4,4,5,6,7,8,9
Mode: 4
Describes the spread of data
What is range?
Science of collecting, organizing, analyzing, and interpreting data in order to make decisions.
What is Statistics?
How do I calculate a fair sample size.
Take the square root of the population?
Find the mean and mode of this set:
3,5,7,7,8,8,8
Mean: 6.6
Mode: 8
What should be the sample size if the population is 625
25
All the members in a group.
What is Population?
A sample where everyone has the same chance of being chosen.
What is a random sample?
Find the mean and median of this set?
3,4,5,6,7,8,10
Mean: 6.1
Median: 6
Data that has no skew - creates a bell curve
What is normal distribution?
A subset, or part, of a population.
What is Sample?
A sample where every 5th person in a queue is chosen.
What is a systematic sample?
What is the mean, median, and mode of this set:
1,1,1,1,2,3,4,5
Mean: 2.25
Median: 1.5
Mode: 1
If a fishpond has 260 Goldfish and 320 Carp, how many of each should I select for a sample size of 50?
22 Goldfish
28 Carp
Data used to describe information that is divided into groups, such as colours (uses words)
What is categorical data?
A sample where each group represents a proportion of the population (so if there are more boys in the population there will be more boys in the sample)
What is a Stratified sampling?
What is the, mean, median, and mode of this set:
509, 50, 20, 80, 45, 50, 30,
Mean:112
Mode:50
Median: 50
I take a random sample of jellybeans. I get 25 green and 40 bule. If there are 1250 jellybeans in the container, estimate how many are green and how many are blue.
Green = 481
Blue = 769