# Question: 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.

a) Find the z-score of the observed proportion.

b) Is there evidence that the proportion has decreased?

c) Explain your conclusion.

## Answer to relevant Questions

A Statistics professor has observed that for several years about 13 % of the students who initially enroll in his Introductory Statistics course withdraw before the end of the semester. A salesperson suggests that he try a ...For each of the following, write out null and the alternative hypotheses, being sure to indicate whether the alternative is one-sided or two-sided. a) Consumer Repons discovered that 20% of a certain computer model had ...For the confidence intervals of Exercise 14, a histogram of the data looks like this: Check the assumptions and conditions for your inference. Describe how the width of a 95% confidence interval for a mean changes as the standard deviation (s) of a sample increases, assuming sample size remains the same. In 2012, a large number of foreclosed homes in the Washington, DC, metro area were sold. In one community, a sample of 30 foreclosed homes sold for an average of $ 443,705 with a standard deviation of $ 196,196. a) What ...Post your question