How: You've ran the test on a bunch of hosts and create a spec from ranges.
Why: you might be concerned with network connectivity (you don't get to choose which data center you launch in and it might not be exactly equal), noisy neighbors on shared hosts, etc. if you're measuring for networking, you probably are spinning ups separate accounts/using a bank of accounts and something in every az until you find what you're looking for.
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How: You've ran the test on a bunch of hosts and create a spec from ranges.
Why: you might be concerned with network connectivity (you don't get to choose which data center you launch in and it might not be exactly equal), noisy neighbors on shared hosts, etc. if you're measuring for networking, you probably are spinning ups separate accounts/using a bank of accounts and something in every az until you find what you're looking for.