How to make a field value between X and Y numbers.

There are two field properties that need to be set to do validation like this. The minimum value property is where you specify the smallest number that is acceptable. The maximum value property is where you set the largest number that is acceptable. 

Validation based on whether another field is populated with a specific value

It is fairly common to have to make a field required if another field is populated or selected.  For example, if the testing site name is CVS.

There is a property called required if that can be used to handle this.  Clicking on the field will open the expression builder. If you just need to make a field required if a second field has a specific value, just enter the other field's binding name into the value one field, select 'is' for the operator and enter the string into the value two field.

When you click the Done button, the property will be display as shown below.