3. In San Francisco, from a sample of 400 automobile owners, 125 own vehicles of a certain brand; in Miami, out of 600 owners, 180 own the same brand. Find a confidence interval of 95 % for the difference between the fraction of owners of this vehicle brand in San Francisco and Miami. Use the formula: Confidence Interval

Q: Ninety-four percent of students said that cash is their top choice for a graduation gift. If 75…

A: It is given that sample size (n) is 75and the sample proportion value is 0.94.

Q: A recent study of high school students shows the percentage of females and males who have at LEAST…

A: The (1-α)% confidence interval for the difference in population proportions p1-p2 is given by;…

Q: Find the confidence coefficients ( CC) for each of the following: 1. n=6, 90% confidence 2. n-=7,…

A: Note: Please repost remaining subparts as i can answer only 3 subparts as per my policy.

Q: f n=450 and X = 360, construct a 99% confidence interval.

A:

Q: following is a 95% confidence interval for the proportion of all students at the school who ate…

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Q: If n=30, (x-bar)=38, and s=8, construct a confidence interval at a 90% confidence level. Assume the…

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Q: A volunteer wearing a caveman mask was scolded by 158 out of 444 crows he encountered, and the crows…

A: Given information, In a study, a volunteer wear a caveman mask scolded by 158 out of 444 crows he…

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A: In 2016, 2087 of 3103 students surveyed said that freedom of the press was secure or very secure. In…

Q: A 95% confidence interval for the proportion p active voters in the municipality of Aibonito is 0.57…

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Q: Having good relationships with coworkers is an important part of overall job satisfaction. A poll…

A: Given, The 95% confidence interval for the population proportion , p is (0.4872,0.5528)

Q: A random sample of size n₁ = 23, taken from a normal population with a standard deviation 01 = 6,…

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…

Q: 95% confidence interval for the true percent of workers in this city who have full health insurance…

A: The question is about confidence interval.Given :Randomly selected no. of workers ( n ) = 1700No. of…

Q: If n=31, (x-bar)=49, and s=3, construct a confidence interval at a 80% confidence level. Assume the…

A: Given, Sample size = 31 Sample mean = 49 Sample standard deviation = 3   Since the population…

Q: A poll of 1060 adults in a country was conducted by telephone. Of those surveyed, 169 had…

A: The sample size is 1060 and number of success is 169.

Q: In a class of 37 students, 47% of them said that math was their favorite subject. Construct an 85%…

A: n=37,p^=0.47α=0.15 Solution-: Let, X= Number of students said that math was their favorite subject…

Q: A random sample of 900 car owners in a particular city found 252 car owners who received a speeding…

A: Given,n=900x=252p^=xnp^=252900=0.281-p^=1-0.28=0.72α=1-0.95=0.05α2=0.025Z0.025 =1.96   (from…

Q: A. A sample of 400 diabetic patients was used in estimating the percentage of diabetics that are…

A: A)Givensample size(n)=400x=42sample proportion(p^)=xn=42400=0.105confidence level=95%

Q: A research intern would like to estimate, with 95% confidence, the true proportion of employees who…

A: Answer: From the given data, Confidence level = 95% Margin of error (E) = 5% = 0.05

Q: An educator wanted to look at the study habits of university students. As part of the research, data…

A: Introduction: The confidence interval at 100 (1 – α) % confidence level gives us an interval…

Q: own residents were interviewed and it was found that 422 responded favorably to a question while 501…

A: given data, 422-favorably responded501-negetively responded 923- total  interviewed for positive…

Q: In a clinical trial of a certain drug, 27 subjects experience headaches among the 219 subjects…

A: From the given information,

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: In a survey of 2325 adults, 711 say they believe in UFOs. Construct a 99% confidence interval for…

A: Suppose, p is the population proportion of all adults, who say that they believe in UFOs.

Q: #4. A college president commissioned a study to find the proportion of students enrolled at her…

A:

Q: Find the confidence level if the n = 32 and xřight = 50.89. %3D

A: Given information- Sample size n = 32 We have given the value χright2=50.89 We have to find the…

Q: In order to make the decision for one business, your team constructed a 90% confidence interval, the…

A: For 90% confidence interval, the width of that confidence interval is 500.We have to reduce the…

Q: Thelma and Louise are each attempting to estimate the proportion of adults who enjoy listening to…

A: Given that.  p=0.29 C.I for Thelma's=(0.242 , 0.338) C.I for Louise's=(0.237 , 0.323)

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: A researcher asks 600 people if they received a flu vaccine, and 65% said they did. What is the 95%…

A: From the provided information Sample size (n) = 600 65% said they received a flu vaccine that is…

Q: Out of 800 adults selected randomly from one town, 272 have health insurance. Find a 90% confidence…

A: Given,   The sample proportion is,

Q: A poll of 2657 U.S. adults found that 86% regularly used Facebook as a news source. Find the margin…

A: Given: n=2657 and p=0.86.   a) The value of z at 90% confidence level is 1.645. Then, the margin of…

Q: 4. A researcher asks 600 people if they received a flu vaccine, and 65% said they did. What is the…

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Q: If n=14, (x-bar)=46, and s=18, construct a confidence interval at a 80% confidence level. Assume the…

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Q: 8. A marketing research company surveyed grocery shoppers in the east and west coasts to see the…

A: (a)   Obtain the 95% confidence interval for the difference between the proportion of customers who…

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Q: Leana is interested in the proportion of people who live in her area who own a dog. She randomly…

A: Suppose p is the population proportion of people who live within one mile of Person L’s home who own…

Q: In 2009, 33% of Americans felt that one parent should stay home to raise the children instead of…

A: Given,n=1015x=416p^=xnp^=4161015=0.4099α=1-0.99=0.01α=0.01

Q: A smart phone manufacturer is interested in constructing a 99% confidence interval for the…

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Q: In a survey of 2000 adults in a recent year, 713 made a New Year's resolution to eat healthier.…

A: We have given that  Sample size n= 2000 Favorable cases x = 713 Sample proportion p^=x/n

Q: Out of 600 people sampled, 240 have shopped online. Based on this, construct a 90% confidence…

A: Find z-critical value:…

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A: Given data For country A n = 997

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Q: In a survey of 2318 adults, 747 say they believe in UFOs. Construct a 99% confidence interval for…

A: The 90% confidence interval for the population proportion is between (0.297,…