Hypothesis & Error Bars Quiz

The variable changed in an experiment is usually on the x-axis of a graph.

• Independent Variable

• Dependent Variable

• Controlled Variable

• Null Hypothesis

A hypothesis suggests a potential result that a researcher expects.

• null hypothesis

• standard hypothesis

• alternative hypothesis

• research hypothesis

What is the hypothesis that states there is no significant difference between treatments, with any observed difference being due to chance?

• Null hypothesis

• Standard hypothesis

• Alternative hypothesis

• Research hypothesis

Which is NOT a null hypothesis?

• There is no difference in intelligence of cats and dogs.

• Americans prefer hot dogs over hamburgers.

• No difference in test scores of coffee drinkers and non-drinkers.

• Students spend equal time on TikTok and Instagram.

"No Overlap" means...

• There is a significant difference between two groups.

• There is no significant difference between two groups.

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