n a recent Zogby International Poll, nine of 48 respondents rated the likelihood of a terrorist attack in their community as “likely” or “very likely”. Use the “plus four” method to create a 98% confidence interval for the proportion of American adults who believe that a terrorist attack in their community is likely or very likely. Interpret your confidence interval.

Q: Public Policy Polling recently conducted a survey asking adults across the U.S. about music…

A: Given data  N = 571 X = 80 99% confidence interval

Q: A professor wanted to know what proportion of college students believe in ghosts. She polled 200…

A:

Q: You are told that a survey produced a 90% confidence interval for the mean spent on utilities per…

A:

Q: A university dean is interested in determining the proportion of students who receive some sort of…

A:

Q: A recent survey suggests that 52% of Americans say dogs are their favorite animals. If 84 people are…

A: As per honor code, we will only answer first question: 1)  p=0.52 n=84, p^=0.42 Use the formula of…

Q: To assess the proportion of the readers of a magazine being professional, a random sample of 1000…

A: Given that the random sample of 1000 readers is selected and 660 are found to be professionals. That…

Q: in a sample of 855 bartenders, 48.0% report hearing complaints from patrons about their jobs. If the…

A: From the given information, the sample size (n) is 855. The sample proportion (p) is 48% that is p =…

Q: Describe when you would use a t-score instead of a z-score when finding a confidence interval.

A: Describe in what conditions t-score would be used instead of a z-score when finding a confidence…

Q: find Construct the 80% confidence interval. Step by step  Based on the confidence interval, is it…

A: Given: The value of n is 474. The point estimate for the proportion of college graduates among the…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.