Fannie Rate adjustments for investment property

[Todd Willhoite]

I see rates on the internet for primary homes 30 year fixed rates.  Is there a typically formula for how much that rate should increase if the property is an investment property instead of an owner occupied property?  Is there a typical increase in the rate if the house does not have a mortgage but is doing a cash out refinance?

If it makes a difference the property is in Oklahoma.