The Sugar Producers Association Wants to Estimate the Mean Yearly

Multiple Choice

The Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 25 people reveals the mean yearly consumption to be 27 kg with a sample standard deviation of 9 kg. Assume a normal population. For a 90% confidence interval, what is the critical value needed?

A) t = 1.708
B) t = 1.711
C) t = 2.797
D) z = 1.645
E) z = 1.96