In the same 2012 survey conducted in Exercise 43 Gallup
In the same 2012 survey conducted in Exercise 43, Gallup reported that 66% of American investors say that the federal budget deficit is hurting the U.S. investment climate “a lot.” Is there any evidence that the percentage has decreased from the 79% reported in September 2011?
a) Find the z-score of the observed proportion.
b) Is there evidence that the proportion has decreased?
c) Explain your conclusion.
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