# which hypothesis test to use

#### Nagaraj

##### New Member
I have the mouse growth data as shown below.

There are two cages.
Cage-1 has 'type-A' mouse and Cage-2 has 'Type-B' mouse.
Each cage has 4 mouses.
Every week each mouse weight and total food consumption per cage are recorded.

I want to do the hypothesis testing and find which type of mouse (A or B) has higher weight growth.

What hypothesis test is suitable for this problem?

Thanks.

#### Karabiner

##### TS Contributor
What exactely do you mean by weight growth? Weight difference between baseline and last measurement?

With kind regards

Karabiner

#### Nagaraj

##### New Member
Thanks Karabiner.

This test is about obesity. Type-A mouse is genetically modified and its weight gain is less compared to Type-B mouse.
By seeing the weight at any instant, it is simple to tell type-A mouse has lesser weight than type-B.
but we need to prove this concept using statistic model and hypothesis testing.

Frankly, I dont understand how to proceed further. I think the mean weight of type-A and type-B has to be compared. Pl. correct me if I am wrong.

Thanks.

#### Karabiner

##### TS Contributor
A simple approach would be to calculate the weight difference between first and last measurement for each mouse, and to compare these values between cages using Mann-Whitney U-test. But I am not sure if there is any chance to observe a result with p < 0.05 with the U-Test based on only 8 observations.

With kind regards

Karabiner

#### Nagaraj

##### New Member
Thanks Karabiner for your time and help. Will do the U-test and check it.

Thanks.