At Ajax Spring Water, a half-liter bottle of soft drink is supposed to contain a mean of 540 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 538 ml. At the .05 significance level, can we conclude that the mean fill of the bottles are different from 540 ml?
- Write the hypothesis statements.
- Explain what test statistic will be used and why.
- Compute the statistic