A coffee-dispensing machine is supposed to deliver 8 ounces of liquid into each paper cup, but a consumer believes that the actual mean amount is less. The consumer obtained a sample of 16 cups of the dispensed liquid with a sample mean of 7.75 ounces and a sample variance of 0.81 ounces. If the dispensed liquid delivered per cup is normally distributed, the appropriate decision at a=0.05 is to:
- Increase the sample size
- Fail to reject the 8-ounce claim
- Reduce the sample size
- Reject the 8-ounce claim
- Maintain the status quo