Your question is interesting and can have many answers and all the correct ones
Everything depends on the Crossing currency, the day on the week, the hour of trading and the feeling of the market between many other factors.
For example, just now I am observing the graph of the pair GBP/USD 1 H time frame.
The information that I emphasize is the differences between two candles:
Candle A
Date: 28/Nov/08
Hour: 05:00
High: 1.5402
Low: 1.5390
Range or Span of the price: 12 pips
Volume: 77
Versus
Candle B
Date: 28/Nov/08
Hour: 09:00
High: 1.5447
Low: 1.5400
Range or Span of the price: 47 pips
Volume: 1,105
As you can see, the candle B have almost four times high the range of the candle A (12 vs. 47) but the volume is moren than 15 times (70 vs. 1,105)
Therefore the conclusion is: [B]we cannot establish a correlation that give a response to your question[/B].
That such if we invent a factor that allows us to determine that volume was necessary for the change of price of a currency, this is, to divide the total change of price between the volume happened during a certain period of time.
We will be call him volume impact in the price (VIP)
This “new” index was calculated dividing the volume negotiated between the number of pips maximum that I change the price for the same period of time (in this case an hour) in the different hours of the day
In the candle A VIP is 77/12 = 6.4
In the candle B VIP is 1,105/47 = 23.5
Regards