xbar = 2172.444
z= (xbar-mu)*sqrt(9)/s = 12.444*3/9.382312= 3.979 = 3.98
P( Z> 3.98)= 0.00003
p value = 0.00003 < 0.025
Hence we reject the null hypothesis.
There is evidence that holdlonger has resulted in increasing the shelf life
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