A nationwide poll of 2,525 adults estimated with 95% confidence that the proportion of Americans who support health care reform is 0.78 +/- 0.0162. A member of Congress thinks that 95% confidence isn't enough. He wants to be 99% confident. How would the margin of error of a 99% confidence interval based on the same sample size compare with the 95% interval?

Q: A recent study among 150 street hawkers in Cape Town showed that 48 of them are of the opinion that…

A: Given Data: n=150 x=48

Q: In another pre-election poll, a pollster finds that 438 out of 600 people polled favor, Smith.…

A: Given, X = 438 N = 600 The sample proportion is given by:

Q: Mrs. Voorhees claims that a Bowie knife is the most effective method of disposing rowdy campers. In…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: A poll asked 1011 American adults if they believe there was a conspiracy in the assassination of…

A:

Q: A company wants to estimate, at a 95% confidence level, the proportion of all families who own its…

A:

Q: In a recent poll, 190 people were asked if they liked dogs, and 63% said they did. Find the margin…

A: Proportion is almost similar to the concept of probability. Proportion is a fraction of population…

Q: In a recent poll, 360 people were asked if they liked dogs, and 74% said they did. Find the margin…

A: Critical value: The value of α is 0.10 for 90% confidence level. Using excel formula…

Q: In a recent poll, 280 people were asked if they liked dogs, and 51% said they did. Find the margin…

A:

Q: In a recent poll, 300 people were asked if they liked dogs, and 89% said they did. Find the margin…

A: Solution: From the given information, p-hat=0.89 and n=300.

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given: Margin of error (E) =0.05. Confidence interval =95%. Z value for 95% confidence interval is…

Q: In a recent poll, 550 people were asked if they liked dogs, and 10% said they did. Find the margin…

A: Givensample size(n)=550p^=10%=0.10confidence level=99%

Q: In a recent poll, 260 people were asked if they liked dogs, and 13% said they did. Find the margin…

A:

Q: In a recent poll, 480 people were asked if they liked dogs, and 52% said they did. Find the margin…

A: Provided, N=480 P=0.52 be the proportion of people who liked dogs. a=0.10

Q: In a recent poll, 530 people were asked if they liked dogs, and 81% said they did. Find the margin…

A: It is given that the value of n is 530, p hat is 0.81 and the confidence level is 0.99. Now,…

Q: A Gallup poll of 1001 Americans age 18 and over conducted in May of 2013 found that 80% of the…

A: Solution: From the given information, p-hat=80% and the margin of error is 3.2%.

Q: In a recent poll, 120 people were asked if they liked dogs, and 29% said they did. Find the margin…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: A national polling organization wishes to gener- ate a 98% confidence interval for the proportion of…

A: Given data,E=3%=0.03Let p=0.50z-value at 98% confidence is Zc=2.326n=?

Q: A random sample of 360 medical doctors showed that 106 had a solo practice. As a news writer, how…

A: Obtain the percentage of medical doctors in solo practice. The percentage of medical doctors in solo…

Q: In a recent poll, 500 people were asked if they liked dogs, and 54% said they did. Find the margin…

A: Here we need to find the Margin of error corresponding to 95% confidence level.

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: It is given that the confidence level is 0.90 and margin of error (E) is 0.01.

Q: An automotive manufacturer wants to know the proportion of new car buyers who prefer foreign cars…

A:

Q: The figure to the right shows the results of a survey in which 999 adults from Country​ A, 1006…

A: Hey, since there are multiple subparts posted, we will answer the first three subparts. If you want…

Q: In a recent poll, 289 people were asked if they liked dogs, and 17% said they did. Find the margin…

A: Let X be the number of people who liked dogs Given: Number of people or sample size (n) = 289…

Q: In a recent poll, 260 people were asked if they liked dogs, and 32% said they did. Find the margin…

A: Find z-critical value:…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given Information:  Margin of error (e) = 10%  Confidence level = 90%  The z score at 90% confidence…

Q: In a recent poll, 170 people were asked if they liked dogs, and 24% said they did. Find the margin…

A:

Q: A political candidate is anxious about the outcome of the next election. To have his next survey…

A: A political candidate is anxious about the outcome of the next election. To have his next survey…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Solution: From the given information, confidence level is 0.90 and E=0.06.

Q: A company wants to estimate, at a 95% confidence level, the proportion of all families who own its…

A:

Q: A tech company believes that the percentage of residents in the town XYZ that own a cell phone is…

A: Given: p=0.70x=130n=200 The sample proportion is obtained as below: p^=xn=130200=0.65 Hypothesis:…

Q: A study was being done to estimate the proportion of students who receive financial aid. If the…

A:

Q: A Gallup poll asked a random sample of U.S. adults, “Would you like to lose weight?” Based on this…

A: Given 95% confidence interval is (0.56, 0.62)

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given:Margin of error (E) = 0.09Confidence level = 90%Since, the proportion of people that support…

Q: In a recent poll, 150 people were asked if they liked olives, and 23% said they did. Find the margin…

A: Given: n=150 p=0.23 α=0.1

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given that, If the prior information is unknown, assume that the sample proportion is, p^=0.50…

Q: Many people think that a national lobby's successful fight against gun control legislation is…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Find z-critical value:…

Q: Wisconsin Public Radio wants to duplicate a survey conducted in 2011 that found that 68% of adults…

A: From the provided information, Sample proportion (p̂) = 0.68 The z critical value at 90% confidence…

Q: a random sample of 63, the proportion of the sample with a certain characteristic was 0.61. What is…

A:

Q: A recent Gallup poll asked a random sample of 1010 Americans to respond to the statement, "If the…

A: Given,95% confidence interval for the proportion who would respond "Strongly agree" or "Agree" is…

Q: In a recent poll, 410 people were asked if they liked dogs, and 44% said they did. Find the margin…

A: n = 410 p^=0.44 Confidence interval = 95%

Q: In a recent poll, 100 people were asked if they liked dogs, and 90% said they did. Find the margin…

A: Obtain the margin of error at the 95% confidence level. The margin of error is obtained below as…

Q: In a recent poll, 480 people were asked if they liked dogs, and 44% said they did. Find the margin…

A: Given: Sample size, n =480 p^=44%=0.44 Confidence interval = 90% At 90% C.I:…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: As there is no any estimates available, the sample proportion is assumed to be 0.50, that is,…

Q: In a recent poll, 210 people were asked if they liked dogs, and 59% said they did. Find the margin…

A: Find z-critical value:…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given dataError = 2.5% = 0.025Confidence level = 0.995Significance level = α=1-0.995=0.005

Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.