Is she attracted to me? They avoid eye contact but smile?

What does it mean when a girl gives a shy smile but doesn't make any eye contact?

I've noticed for different situations - at work, restaurants etc.

I.e. I noticed for different women when I walked down a hall at work, they would notice me from far away, and as I approach closer they would smile and blush, but would avoid eye contact by looking down or straight ahead.

Same but similar situation happened at a store a number occasions when I bought something, the clerk (woman), smiles and blushes as she hands me the item, yet avoid eye contact.

Is this a sign that women are attracted to me, or does it mean something else?
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By the way these are total strangers (don't know them, and 100% sure they don't know me. If at work, it happens on some different floor / department). It'll be one woman walking by (not in pacts), and be a total stranger to me.
Is she attracted to me? They avoid eye contact but smile?
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