Interpreting Error Bars

True or false: Oranges are more expensive than apples.

• True, the average price is higher.

• True, there is a significant difference due to overlapping error bars.

• False, there is no significant difference due to overlapping error bars.

Which group had a decrease in reaction time after treatment?

• Group A

• Group B

• Group A & B

• Group C

Is there a statistical difference between these samples?

• Yes, because the error bars overlap

• No, because the error bars overlap

• Yes, because the error bars don't overlap

• No, because the error bars don't overlap

Repeating the experiment for Sample two would most likely give a result between:

• 6-12

• 8-15

• 0-16

• 11-12

Sample B:

• Has small error bars and is more precise than Sample A.

• Has small error bars and is less precise than Sample A.

Which data set is the least precise?

• hot

• warm

• cold

The hot and warm glow sticks will glow for a significantly different amount of time from each other.

• True

• False

The hot and cold glow sticks will glow for a significantly different amount of time from each other.

• True

• False

The warm and cold glow sticks will glow for a significantly different amount of time from each other.

• True

• False

What is the independent variable?

• Time of glowing

• Temperature of glow stick

• Brand of glow stick

• Temperature of room.