Bellringer

Grades

Create a frequency distribution based on this data.

Today• We are going to define our next research

method: Correlational Research

Why should I care?

Correlations are all around us. Money, love, health, success, hatred and learning.

The relationships in this world are surprising and interesting. You sound cool knowing them.

Vocabulary

1. Correlation: relationship 2. Manipulate: to change3. Variable: something that can be changed4. Causation: to cause something to happen

Did you know?

Ice cream consumption leads to murder.

Correlation

• https://www.youtube.com/watch?v=McdD9Ng4VnY

How would you describe the relationship between the season and the number of injuries people get?

How would you describe the relationship between…?

• Correlational Research: investigates how two variables are related. – How does the SEASON relate to the NUMBER OF

INJURIES people get– How do IQ TEST SCORES relate to AMOUNT OF

MONEY people make at their job?– How does STRESS relate to DISEASE?

• Positive Correlation: variables go up or down together

• Negative Correlation: variables go opposite directions–Common confusion: positive is NOT

good. Negative is NOT bad.–Think POSITIVE = TOGETHER, NEGATIVE

= SEPARATE WAYS

POSITIVE NEGATIVE

Practice

• As the amount of tooth-brushing goes up, the amount of cavities goes down– Negative correlation (separate ways)

• As the amount of caffeine I drink goes up, the amount I have to pee goes up.– Positive correlation (TOGETHER!)

Group Practice

Label the following correlations as positive or negative. 1. More hours of studying correlate with higher test

scores in school.2. Fewer hours of sleep correlate with lower test scores

in school.3. The more proficient 4th grade reading scores, the less

money the US puts into building prisons. 4. The more Cheetos I eat, the more I bite my nails. 5. The lower the temperature, the less visits to the

hospital are recorded.

Independent Practice

Label the following correlations as positive or negative. 1. The more scary movies I watch, the more

nightmares I get at night. 2. The more hours I spend in the weight room, the

less anxiety I feel during the day. 3. Lower rates of eating fast food correlate with lower

levels of obesity.4. The more you hit your head against a wall, the

more likely you are to get a concussion.

• Scatterplot: graph used to show correlation between 2 variables. – What are the 2 variables?

Values go UP

Values go UP

Explaining the Correlation

As _____________________ (increases/decreases), ___________________________ (increases/decreases).

As a result, _________________________ may

be correlated with ______________________.

Correlation

• Variables:• Correlation?

As years of education increases, the average income of a person also increases.

Practice• Variables:• Correlation?

Causation?• Over the weekend, New York City saw its warmest weather

so far this year, and as it turns out, the weekend was also marked with increased levels of violence. The sweltering Big Apple had 25 shootings in the span of 48 hours, leading many to believe that hot temperatures cause shootings.

– What are the 2 variables?– Positive or negative correlation?– SO HEAT CAUSES SHOOTINGS?– Correlation does NOT mean causation

• The warmer the weather, the more likely people are to go outside at night

Correlation?

Ice cream consumption leads to murder.

CORRELATION

DOES NOTEQUAL

CAUSATION

Correlation?

Ice cream consumption leads to murder.

Correlation .977

Marriage rate in Virginia

Scatter Plot Practice

Ruben measured how many minutes he meditated each night and the number of hours he slept.

Plot the data in a scatter plot.

Positive or negative correlation?

Explain this correlation. What can we infer from these results?

Correlation FUN!

http://www.tylervigen.com/discover

Exit Ticket

Label the following correlations as positive or negative1. More hours of practice and higher points scored in

a basketball game2. More Big Macs eaten and more weight gained3. More hours of exercise and lower chances of heart

disease4. More nail biting and shorter nails5. More absences from school and lower graduation

rate

Exit Ticket

• Exam 1:

Homework – Correlation Article

Read the short articles and respond to the short answer questions on a separate sheet of

paper.

Exam 1: September 26 & 29