Gallup Probability 3.2 Questions and Answers 100% Pass

Gallup Probability 3.2 Questions and Answers 100% Pass A recent Gallup poll showed the president's approval rating at 60%. Some friends use this information (along with the sample size from the poll) and find theory-based confidence intervals for the proportion of all adult Americans that approve of the presidents performance. Of the following four confidence intervals, identify the ones that were definitely done incorrectly. (There may be more than one interval that is incorrect.) (0.57, 0.63) (0.58, 0.62) (0.47, 0.53) (0.60, 0.66) (0.47, 0.53) (0.60, 0.66) 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? Entry field with correct answer The p-value The sample proportion The population proportion All of the choices are correct The sample proportion Which of the following is true of a 2SD confidence interval? Entry field with correct answer They can be used for any confidence level. They are approximate 95% confidence intervals. They give exactly the same results as a theory-based interval. The SD represents the standard deviation of the sample data. They are approximate 95% confidence intervals. Which of the following is NOT true about theory based confidence intervals for a population proportion? Entry field with correct answer They can be calculated using different confidence levels. They should only be used when you have at least 10 successes and 10 failures in your sample data. For a given sample proportion, sample size, and confidence level, different intervals can be obtained because of their random nature. The process used to construct the interval relies on a normal distribution. For a given sample proportion, sample size, and confidence level, different intervals can be obtained because of their random nature. Suppose a 95% confidence interval for a population proportion is (0.27, 0.49). Rewrite this interval in the form of ± margin of error. _________ ± ___________ 0.38 ± 0.11