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Take particular note of the 'Unanswered call distribution per hour' as non-zero values indicate that you calls are missing calls going unanswered at that time of the day. You should however also take the Max Wait Time into consideration. If the Max Wait Time is below your SLA, then these calls are of a lesser concern as you couldn't reasonably be expected to answer these calls.
You should also consider your Average Talk Time, as this will give you some idea of how busy your team is. If the Average Talk Time is 5 minutes then your staff can take at most 12 calls each hour (5m x 12 = 60m). In reality you shouldn't normally exepct expect to see utilisations at greater than about 50 minutes of every hour (this no. can vary significantly based on the type of calls being handled and the amount of wrap time required to complete any paper work post each call).
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This defines the reporting period. The start period commences at 12:00am and the end period completes at 12:00am the next morning. On that basis, to select 'all calls' for a 'single day' the start and end periods should be for the same date.
Queue
Defines the set of queues the report will be run for. You can select multiple queues by 'control-clicking' each queue in turn.against.