A factory claims its flour bags contain g on average. From years of machine records the population standard deviation is known exactly: g.
An inspector suspects the bags are underfilled, so she tests
She weighs a random sample of bags and finds a sample mean of g.
What is the value of the test statistic — how many standard errors, and in which direction, the observed sample mean sits from what expects?
Once you get it right, the reasoning behind the answer shows up here.
Select all that apply.