A recent study reported that the U.S. per capita consumption of sweet snacks among healthy weight children aged 12 to 19 years is 251.2 kilocalories per day (kcal/d)with a standard deviation equal to 540 kcal/d.This was based on 24-hour dietary recall records of n = 2265 adolescents.

A similar study performed four years earlier reported the average consumption of sweet snacks among healthy weight children aged 12 to 19 years to be 369.4 kilocalaries per day (kcal/d).

Does this study suggest a change in the average consumption? Perform a significance test using the 5% significance level and determine the result.