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A new type of flare accelerant is tested. A control group of flares (X) that are currently used and a group of flares (Y) with

A new type of flare accelerant is tested. A control group of flares (X) that are currently used and a group of flares (Y) with the new accelerant are tested for their burning times (in minutes) and a 90% confidence interval for X - Y is calculated as (3.85, 4.75). Based on this confidence interval, what, if any, conclusions can we draw at a confidence level of 99%?

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