At Ajax Spring Water, a half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process standard deviation of 4 ml. A sample of 36 bottles shows a mean fill of 518 ml. At the .05 significance level, can we conclude that the mean fill of the bottles are different from 520 ml?
Write the hypothesis statements.
Explain what test statistic will be used and why.
Compute the test statistic.
State the decision rule and sketch it. Based on the decision rule, do you accept or reject the Null Hypothesis?