Suppose That a Researcher Wants to Check to See If

Multiple Choice

Suppose that a researcher wants to check to see if the average household income in
Webster Groves,Missouri,has changed from the $60,000 it was three years ago.The
Researcher takes a random sample of households in Webster Groves and finds that the average income of these households is $58,000.If the standard error of the mean for this sample is $500,what is the approximate value produced by the Z-test?

A) + 4.00
B) + 3.65
C) +2.00
D) ─ 4.00
E) ─ 3.65