In a July 2018 Gallup poll that surveyed 1,033 randomly selected U.S. adults, 5% said that they considered themselves vegetarians. 

a. Describe what the parameter is in this context. 

b. The standard deviation (SD) from the simulated null distribution is 0.007. Use the 2SD method to find a 95% confidence interval for the parameter. 

c. If we had 2,020 in our sample, how would that change the width of our 95% confidence interval? (Circle the correct answer.) Wider Same width Narrower 

d. Using the Theory-Based Inference applet we find both 95% and 99% confidence intervals as shown below. Denote which is which. (0.033, 0.068) (0.037, 0.064)