Broad, Phrase & Exact Match effect on a single keyword

How do matching options affect the same keyword within your ad group.

[luxurysem]

I'm curious to know if anyone has experimented with using broad, phrase and exact match on the same keyword within the same ad group?

Ex:
widget
"widget"
[widget]

I've taken it a step further by using caps and plural variations for testing purposes.

Ex:
widget
Widget
widgets
Widgets
"widget"
"Widget"
"widgets"
"Widgets"
[widget]
[Widget]
[widgets]
[Widgets]

What I've noticed is that in some instances [Widget] has a much better CPA than [widget] (Sometimes it's the other way around). I could not understand why so I contacted Google. They claim that the keywords are essentially one and the same and that over time the better performing one will get most of the clicks and conversions. I am not sure about this explanation and was wondering if anyone has tried this out and had similar experiences? My conversion tracking application captures all the different variations as if they were unique keywords.

[poster_boy]

Capitalization has no impact - it's just splitting the traffic to two keywords vs. one. Unless there's a substantial amount of traffic, the performance will appear different - just the nature of a small statistical sample size.

[hibuddy]

What is that means .

[widget]

If I want to have a broad match I usually type the keyword without any special characters like this

widget

Is this right?. Please help me.Thanks...

[CernyM]

I'm curious to know if anyone has experimented with using broad, phrase and exact match on the same keyword within the same ad group?

We do this as our standard approach.

We have found that the performance of each match type is different and need different bid prices to meet our desired cost-per-acquisition targets.

[hibuddy]

Please share your thoughts on it...Thanks...

What is that means?.
[widget]

If I want to have a broad match I usually type the keyword without any special characters like this

widget

Is this right?.