If my taxable income is a round number, how is tax calculated in the tax table?

I want to be sure I pay the right amount in tax.  How is tax calculated when my taxable income is a round number?  

For example, say my taxable income is $1,000.  The tax table says there are two options that could apply: the first tax calculation is for the $950 - $1,000 range and another tax calculation is for $1,000 - $1,050.  

If my taxable income is $1,000, does that mean both ranges apply, so theoretically I could take the slightly smaller tax calculation based on the $950 - $1,000 range?

This is confusing and I want to be sure and pay the right amount.  Thank you in advance for your help.