Chapter 03.2 Exercise Question 01

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A Gallup survey of 1001 randomly selected U.S. adults conducted May 2011 asked, "In your opinion, which one of the following is the main reason why students get education beyond high school?" 50 three percent chose "to earn more money." Based on these data, I found the 95% confidence interval for the proportion of U.S. adults who choose "to earn more money" to be (0.499, 0.561). Which of the following is a valid statement?

a. A 99% confidence interval based on the same data would be wider.

b. A 99% confidence interval based on the same data would have the same width as the 95%

confidence interval.

Chapter 03.2 Exercise Question 03

Suppose a 95% confidence interval for a population proportion is found using the 2SD or theory-based method. Which of the following will definitely be contained in that interval?

a. All of the choices are correct

b. The population proportion

c. The sample proportion

Chapter 03.2 Exercise Question 04

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Which of the following is true of a 2SD confidence interval?

a. They can be used for any confidence level.

b. They are approximate 95% confidence intervals.

c. They give exactly the same results as a theory-based interval.

Chapter 03.2 Exercise Question 20

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From a random sample of 88 male students at Hope College, 14 were left-handed. Using the theory-based inference applet, determine a 99% confidence interval for the proportion of all male students at Hope College that are left -handed.Round your answers to 4 decimal places, e.g. "0.7523."

The confidence interval is______________to_________________

Chapter 03.2 Exercise Question 26

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Using the formula,compute a 95% confidence interval for a population proportion given the sample proportion is 0.33 and the sample size is 1099. Round your answers to 4 decimal places, e.g. 0.7523. 0.0278

The confidence interval is

____________________to_________________

Chapter 03.2 Exercise Question 06

Suppose a 95% confidence interval for a population proportion is (0.30, 0.60). Rewrite this interval in the form ofp^

margin of error.

____________________

Chapter 03.2 Exercise Question 23

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In order to determine who would accept a Facebook friend request from someone they didn't know, a student researcher made up a phoney Facebook profile that represented a male student at her college. She then sent out 112 friend requests and 16 of these accepted the request. Using the theory-based inference applet, find a 95% confidence interval for the proportion of all students that would accept a Facebook request from a male at their college that they did not know.Round your answers to 4 decimal places, e.g. 0.7523.

Confidence interval is

_________________to_______________