Data Analysis

Data Analysis

I can use data to determine if a hypothesis is accurate.

What is Data?

• The information gained from observing and testing an experiment.

What is data used for?

• Scientists use data to gain understanding and make conclusions.

• Data can help us learn if our hypothesis is correct or incorrect

Let's practice gathering data!

Students are holding a fundraiser. They are selling ice cream. They want to determine which is the most popular product.

Hypotheses

Sarah's hypothesis is "Since the sundae has the most ice cream, the sundae will be the most popular choice."

Data Table

Sarah made a table to collect her data. Each day she will record the number of each product that is sold.

Data Table

At the end of the three days, Sarah had collected all of her data. She determined the average of each product sold over three days.

Multiple Choice

How many sundaes were sold on Monday?

• 130

• 78

• 45

• 20

Multiple Choice

On which day were there more milkshakes sold than sundaes?

• Monday

• Tuesday

• Wednesday

Multiple Choice

Why would Sarah collect data for three days instead of just one?

• Repeating an experiment gives more accurate data.

• She wanted to know how much money she had raised.

• She wanted to see if she was right.

Multiple Choice

Which product was the most popular?

• Sundae

• Milkshake

• Cone

• Popsicle

Multiple Choice

How did you determine which product was the most popular?

• I used the average

• I added them together

• I guessed.

Lets practice reading more!

Which dog breed is the fastest?

John wanted to determine which dog breed was the faster - Dalmatian, Labrador, or Doberman.

Multiple Choice

Which of these is a correctly written hypothesis?

• Dalmations

• Labradors are fastest

• Labradors will be faster than Dobermans or Dalmatians because they are work dogs.

Testing his hypothesis

John is going to test 5 different dogs from each breed. He has 5 Labradors, 5 Dalmatians, and 5 Dobermans.

Each dog is going to run 30 meters.

John created this data table.

He will find the average speed for each dog breed at the end.

Open Ended

Why would John use five different dogs instead of just one dog from each breed?

John would use 5 different dogs because it gives him a better representation of the breed, instead of just one particular dog.

​

Here are the results of his experiment

​

Multiple Choice

Which dog was the fastest?

• Doberman #3

• Poodle #1

• Labrador #4

Doberman #3 was the fastest

It took the least amount of time to run 30 meters, so it is the fastest of all 15 dogs.

Multiple Choice

Which dog breed was the fastest?

• Doberman

• Labrador

• Poodle

The Doberman is the fastest

After John found the average time it took for each breed, he learned that Doberman's are the fastest.

Let's remember what John's hypothesis was:

"Labradors will be faster than Dobermans or Dalmatians because they are work dogs."

Multiple Choice

Was John's hypothesis correct? "Labradors will be faster than Dobermans or Dalmatians because they are work dogs."

• Yes

• No

Open Ended

What information did you use to determine that John's hypothesis was incorrect?

Multiple Choice

What could John do to make his experiment results more reliable?

• Test the same 5 dogs again

• Do the same test on more dogs of the same breeds

• Test 5 more dogs of a different breed

John's experiment would be more reliable if he had a larger sample size. The more subjects in his experiment, the more reliable the results will be.

​

Open Ended

Why is it important to collect data during an experiment?