An airline transports over 10 000 passengers daily, and the airline is curious what proportion of their passengers use mobile boarding passes instead of paper passes. They take a simple random sample of 80 passengers and find that 75% of them use mobile boarding passes. Based on this sample, which of the following is a 90%, percent confidence interval for the proportion of passengers who use mobile boarding passes?

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A: The p-value of the test is 0.103. The decision is fail to reject H0.

Q: Find the value of t a/2 for a 99% confidence interval when the sample size is 30

A: Given Confidence = 99% n=30

Q: If n-29, 7(x-bar)-35, and s-7, construct a confidence interval at a 90% confidence level. Assume the…

A:

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Q: In the construction of confidence intervals, if all other quantities are unchanged, a increase in…

A: Solution: The confidence interval is calculated by using the following formula

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A:

Q: When constructing a confidence interval, if we construct a confidence interval with a 95% confidence…

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Q: In a survey of 950 randomly selected individuals, 17% answered yes to the question "Do you think the…

A: Sample size, n = 950Probability = 17% = 0.17 90% confidence level

Q: You observe 60 customers at a coffee shop, and 82% of them tip. What is the 95% confidence interval…

A: Given : You observe 60 customers at a coffee shop, and 82% of them tip.

Q: In a survey, a random sample of teenagers were asked whether they have a sibling. The resulting…

A:

Q: A random sample of 12 students showed the following time (in hours) of sleep 4.5 5 5.5 6 6 7 7.5 7.5…

A: Given data  4.5,5,5.5,6,6,7,7.5,7.5,8,9,5,7 n=12

Q: 1. In a recent poll 62 out of 149 randomly chosen students at Allen High School say they plan to buy…

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Q: random digit dialing telephone system was used to conduct a survey asking 3230 city residents; "do…

A:

Q: The production manager in an automobile plant is concerned with the number of cars that do not pass…

A: Not acceptable = 120-92 = 28

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A:

Q: Gallup is a company that carries out daily opinion polls on a variety of topics. In a recent daily…

A: The confidence interval can be found by using the formula p±zp(1-p)n

Q: A simple random sample of 120 vet clinics in the Midwest reveals that the vast majority of clinics…

A: Given that; Sample size (n) = 120  X = 88  At 90% confidence interval .

Q: The figure to the right shows the results of a survey in which 1003 adults from Country A, 1024…

A: Given information For country A p-hat = 0.35 n = 1003

Q: If someone were to ask you what this particular confidence interval means, what would you say?

A: According to confidence interval  In the given image  The given confidence interval is Just…

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Q: A survey of 620620 men shoppers found that 1111% of them shop on impulse. What is the 9595%…

A: Given,sample size(n)=620sample proportion(p^)=0.111-p^=1-0.11=0.89α=1-0.95=0.05α2=0.025Z0.025=1.96…

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

A:

Q: Which of the following would result in the narrower confidence interval?

A: Note: The confidence interval with small confidence level has the narrower confidence interval. The…

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Q: A researcher computed a 90% confidence interval for the proportion of students who smoke. If the…

A: False. Relationship between confidence level and error:The error value increases when the confidence…

Q: A survey of 800 women shoppers found that 17% of them shop on impulse What is the 98% confidence…

A:

Q: In a certain high school, 7 out of 11 juniors said that they planned to go to the winter prom.…

A:

Q: In a statistics activity, students are asked to determine if there is a difference in the proportion…

A: Given : Claim : there is a difference in the proportion of times that a spinning penny will land…

Q: n our Condor Cafe, the Oxnard College Culinary Program offers the most delicious and affordable…

A: Given that, n=255,x=75

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A: It is given that x is 54 and n is 200.

Q: 1(c). Construct a 99% confidence interval for the true proportion of people who liked the chocolate…

A: here use given data table

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A: The confidence interval depends on the three factors: Confidence level: The width of the…

Q: The true proportion of c.c. students in her state, that receive an AD, is contained in that specific…

A: It is given that the confidence interval in b is calculated correctly.

Q: The 2010 General Social Survey reported a sample where about 48% of US residents thought marijuana…

A:

Q: The figure to the right shows the results of a survey in which 999 adults from Country A, 1002…

A:

Q: As the sample size gets smaller, what happens to the width of your confidence interval? O Wider /…

A: A confidence interval is an interval with a certain probability that a parameter will fall between…

Q: Hi. How do you calculate this problem? Is there a way to do this on a TI-83? Thanks.

A: Note:Hi, we are solving this problem with manual calculations. Thank you.

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A: Given data: N = 1025 X = 552 Confidence level  = 95 %

Q: if n=20, x=43, and s=9, construct a confidence interval at a 98% confidence level, the data came…

A:

Q: The manager of a car company will select a random sample of its customers to create a 90 percent…

A: From the provided information, Confidence level = 90% Margin of error = 0.06

Q: For a sample with a mean of 10, a std of 5 and an n of 30, what is the lower bound of the 95%…

A: Given data, x=10σ=5n=30z-value at 95% confidence is Zc=1.96

Q: In the construction of a confidence interval, if all other quantities are unchanged, an increase in…

A: Property of confidence interval:

Q: A survey of a random sample of 256 college students found that 36% said they frequently experience…

A: For a known sample proportion, we want an interval to be estimated, which will include the true…

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Q: A random sample of married people were asked "would you remarry your spouse if you were given the…

A: Given information x = 127 N = 150

Q: In terms of z scores, a 99% confidence interval consists of which of the following ranges? 1. ±1 z…

A: We know, If Z~N(0,1) Then, P(a < Z < b) = P( Z < b ) - P( Z < a) Also,  P( - a < Z…

Q: Of 500 randomly selected college students, 200 use a particular brand of mobile phone. Assuming that…

A: Given : x = 200 n = 500 p^=xn=200500=0.4The formula for confidence interval is :p^±zcp^(1-p^)n