In fair to say the guarantee will be

In conclusion, there is a ninety-five
percent probability that the wings will be delivered within thirty minutes.
However, this means there is a five percent probability that the wings may not
be delivered on time and be supposed free to the customers. Even though doubtful,
the probability suggests that one out of every twenty customers may have a free
meal. With a ninety-five percent probability that the orders will be there in
less than thirty minutes, it is fair to say the guarantee will be a successful
promotion.

John is not concerned with the
amount of time it would take for his orders being picked up within the
thirty-minute timeframe however his fear was if the deliveries could be
delivered in thirty minute as well. This included cooking, packaging and
delivering all within that amount of time. John wanted to analyze and discover
the percentage of deliveries would result in customers receiving a free order
on Saturday’s. Using the z-test and statistics testing, Z= -21.76

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