**Hypothesis**

Once you have a good experiment question, it is time to make predictions about how your experiment will turn out. As a scientist you want to think about all possible answers your experiment might give you. To do this we write several hypotheses.

## Null Hypothesis

H0: There is no differencebetween your two groups ( they are =)

## Alternative Hypothesis 1

Ha1: One of the groups is the winner

## Alternative Hypothesis 2

Ha2: The other group is the winner

Example:

Are there more arachnids (spiders) in my basement or are there more centipedes?

H0: There are equal numbers of arachnids and centipedes in my basement

Ha1: There are more arachnids in my basement than centipedes

Ha2: There are more centipedes than arachnids in my basement

**Take these experiment questions and make them into good hypotheses. **

**1. Are there more bacteria on the toilet handle or on my science desk? **

H0: ________________________________________________________

Ha1: ________________________________________________________

Ha2: _________________________________________________________

**2. Which lunch will give me more energy, chicken patty or meatloaf? **

H0: ________________________________________________________

Ha1: ________________________________________________________

Ha2: _________________________________________________________

**3. Do birds with longer or shorter wings fly faster? **

H0: ________________________________________________________

Ha1: ________________________________________________________

Ha2: _________________________________________________________

**4. Will a plant inside a closed plastic bag grow taller than a regular plant **

H0: ________________________________________________________

Ha1: ________________________________________________________

Ha2: _________________________________________________________

**5. Which crayfish has the longer pinchers, male or female? **

H0: ________________________________________________________

Ha1: ________________________________________________________

Ha2: _________________________________________________________

**6. Does caterpillar feces weigh the same as the leaf they ate? **

H0: ________________________________________________________

Ha1: ________________________________________________________

Ha2: _________________________________________________________