The Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 27 kg with a sample standard deviation of 9 kg. Assume a normal population. For a 99% confidence interval, what is the critical value needed?

Multiple Choice

• t = 2.947
• t = 1.753
• z = 1.645
• z = 1.96
• t = 2.131