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A manufacturer wants to increase the shelf life of a line of cake mixes. Past records indicate that the average shelf life of the mix is 216 days. After a revised mix has been developed, a sample of nine boxes of cake mix had a mean of 217.222 and a standard deviation of 1.2019. At the 0.025 significance level, decide if the sample data support the claim that shelf life has increased. State your decision in terms of the null hypothesis.
Retire
The act of leaving one's job and ceasing to work, typically due to reaching a certain age or for health reasons.
Beginning
Beginning, in financial terms, often refers to the starting point or initial value of an account, inventory, or financial statement at the onset of a period.
Nominal Annual Interest Rate
The percentage of interest charged on a loan without adjustment for the effect of compounding or inflation over a period of a year.
Deposits
Funds placed into an account at a banking institution, typically earning interest over time.
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