A sociologist wants to construct a 94% confidence interval for the proportion of teenagers who uses Yelp as online directory of restaurant.  The Yelp company estimated the nationwide proportion to be 0.23. What sample size needed so that the confidence interval will have a margin of error 0.02?

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

A: Sample size:The minimum sample size for a desired confidence level, α with a given margin of error,…

Q: Suppose we wanted to estimate the average amount of sleep (in hours) a college student gets a night.…

A: Confidence interval : Confidence interval is a range of values it contains the true population…

Q: A collage professor would like to estimate the proportion of students who pull an *all-nighter,"…

A: Given: n = 100 99% Confidence interval = (0.48 to 0.62) Formula Used: Confidence interval = p^ ±…

Q: What is the margin of error if we find a 95% confidence interval for the percentage of Corvettes on…

A:

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: We would like to know: "What percentage of college students drink alcohol every day?" In a random…

A: Given that, N=500 X=75

Q: We would like to know: "What percentage of college students read the college newspaper every day?"…

A: It is provided that there is random sample of 500 college students in which 231 students said that…

Q: A magazine provided results from a poll of 1000 adults who were asked to identify their favorite…

A: Confidence interval:The (1-α) % confidence interval for proportion p is given by,

Q: A researcher was interested in knowing how many people in the city supported a new tax. She sampled…

A:

Q: A students wants to estimate the proportion of professors who drive pickup trucks. She surveys 250…

A: Confidence interval is an inference process which gives the range of plausible values of population…

Q: A magazine provided results from a poll of 2000 adults who were asked to identify their favorite…

A: A magazine provided results from a poll of 2000 adults who were asked to identify their favorite…

Q: A large trucking company wants to estimate the proportion of its trailer truck population with…

A: Solution: From the given information, n=200, p-hat is 0.30 and the confidence level is 0.90.

Q: An environmentalist would like to estimate the true mean weight of all cars. To do so, she selects a…

A: We have given that,  The 90% confidence interval for true mean weight to be 2.8 to 3.4 .  Then,  We…

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Solution: From the given information, confidence level is 0.96 and E=0.02.

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

A: Solution:There is no estimates available, hence the sample proportion is assumed to be 0.50.The…

Q: What should your sample size be if you want a confidence level of 90 percent and a margin of error…

A: We want to find the sample size (n)

Q: process control engineer wishes to estimate the true proportion of defective computer chips by using…

A: GivenThe true proportion p=0.01Let the sample size be n.The Z critical value for 90% confidence…

Q: Seventy-three percent of a sample of 1000 students drive a used car as opposed to a new car or no…

A: Given: Proportion  = 73 % Confidence level  = 80 %

Q: Professor Smith loves dark chocolate, and she would like to find out the proportion of the…

A: Given Information: Sample size (n) = 850 Out of which x = 600 people chose dark chocolate.…

Q: We plan to sample students to construct a 98% confidence interval for the proportion who uses Yelp…

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: What proportion of college students earn their undergraduate degrees in four years? A college…

A: The formula of the margin of error when the limits given are,

Q: A magazine provided results from a poll of 1500 adults who were asked to identify their favorite…

A: It is given that the confidence levels are 0.80 and 0.99.

Q: A magazine provided results from a poll of 1000 adults who were asked to identify their favorite…

A:

Q: To determine the proportion of Americans who support affirmative action policies for minorities and…

A: The objective is to define the sample size for estimating the true proportion of Americans, who…

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

A:

Q: You are going to construct a 99% confidence interval for the proportion of hip replacement…

A:

Q: Assume that you took a sample and calculated the sample mean as 100.you then calculated the lower…

A:

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

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Here,…

Q: We plan to sample parents in order to construct a 99% confidence interval for the proportion who…

A:

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: Suppose we would like to estimate the proportion of all NBA fans who thought Aaron Gordon won the…

A:

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

A:

Q: A sociologist wants to construct a 96% confidence interval for the proportion of children aged 5 –…

A: The z-value for 96% confidence is2.054     ∴ z∝12=2.054a)Given data ,P=0.20M.E=0.02n=?W.C.T…

Q: A large trucking company wants to estimate the proportion of its tracker truck population with…

A:

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

A: Find z-critical value:…

Q: People were surveyed worldwide, being asked the question "How important is acquiring wealth to you?…

A: The sample proportion is calculated using the formula:

Q: Michael wants to make a confidence interval estimate for the proportion of community members in…

A:

Q: An online poll of 810 adults found that 53% of the respondents think critical thinking should be…

A: Given info: An online poll of 810 adults found that 53% of the respondents think critical thinking…

Q: The Pizza Shop wanted to determine what of its customers ordered an only cheese pizza. Out of 90…

A:

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 magazine provided results from a poll of 500 adults who were asked to identify their favorite pie.…

A: From the provided information, Sample size (n) = 500 Sample proportion (p̂) = 0.11

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: A magazine provided results from a poll of 500 adults who were asked to identify their favorite…

A: It is given that the sample size is 500.

Q: An educator wants to construct a 99% confidence interval for the proportion of elementary school…

A: The random variable is elementary school children in Michigan who are proficient in reading. It…

Q: A random sample of high school seniors were asked whether they were applying for college. The…

A:

Q: Imagine that the confidence interval around a candidate's popularity score is [37.22,48.86],what is…

A: The confidence interval provides an estimated range of values that includes an unknown population…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.