Social Networking Sites In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet regularly. Of the Internet users, 1054 use a social networking site.7 Find and interpret a 95% confidence interval for each of the following proportions: (a)   Proportion of US adults who use the Internet regularly. (b)   Proportion of US adult Internet users who use a social networking site. (c)   Proportion of all US adults who use a social networking site. Use the confidence interval to estimate whether it is plausible that 50% of all US adults use a social networking site.

Q: 12. In a sample of 600 Canadians, 265 say they would rather retire in the US than in Canada.…

A:

Q: In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet…

A: Given data, n=2255 x=1787   sample proportion p=x/n =1787/2255 = 0.792   z-value at 90% confidence…

Q: In a random sample of 810 women employees, it is found that 81 would prefer working for a female…

A:

Q: 9. A Gallup poll conducted May 2-7, 2013, by telephone interviews (both landlines and cellular…

A: Z score corresponsing to probability of 0.975 = 1.96

Q: In a random sample of 145 UNO students, we find that 53% have attended a Maverick hockey game at…

A:

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

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: In a survey, people were asked whether they thought sun went around the planet Earth or vice versa.…

A: (a)   Obtain the proportion of people in the survey who believed the sun went around earth. The…

Q: A clinical trial tests a method designed to increase the probability of conceiving a girl. In a…

A: Given: x=297n=540c=99%=0.99

Q: 7. A recent study of 750 Internet users in Europe found that 35% of Internet users were women. What…

A:

Q: b. In the year 2000, a survey of 1103 U.S. adults were asked who they felt was the greatest…

A:

Q: The figure to the right shows the results of a survey in which 1015 adults from Country​ A, 1018…

A: The 99% confidence interval for population proportion is For 99% confidence, zc = 2.58

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

A:

Q: 1. A consumer watch group interviewed a random sample of 1000 consumers and asked them if they are…

A: Here use confidence interval for population proportion

Q: The owner of the AGT Gas Station wishes to determine the fraction of customers who pay using a…

A:

Q: 6.24 Social Networking Sites In a survey of 2255 randomly selected US adults (age 18 or older), 1787…

A: It is given that out of 2255 US adults, 1787 US adults use the internet regularly. Let pA be the…

Q: In a survey of 50,00 people, 80% indicated that they listened to their favorite radio station…

A: Hern= 5000 P^ = 0.80 We have to construct 95% ci for p

Q: n a survey of 2480 golfers, 372 said they were left-handed. Construct a 92% confidence interval for…

A: The given data is appropriate for single proportion confidence interval . because it is a large…

Q: 1992, the women in two statistics classes for students in the liberal arts at a large northeastern…

A: In 1992, the women in two statistics classes for students in the liberal arts at a large…

Q: 11. A television station surveys 200 customers and finds that 23% of customers watch the evening…

A: Margin of error = z*√(pq/n) Where z= z value            n=no of customer            q=1-p…

Q: The figure to the right shows the results of a survey in which 1005 adults from Country​ A, 1023…

A: From the provided information, Sample size of Country B (n) = 1023 Sample proportion (p̂) = 0.22…

Q: 1. The Hartford Insurance Company wants to estimate the percentage of drivers who change tapes or…

A: Please see the attachment..

Q: Of 380 randomly selected medical students, 210 said that they planned to work in a rural community.…

A: Solution: Let X be the number of medical students said that they planned to work in a rural…

Q: in a recent poll, 220 people were asked if they liked dogs, and 36% said they did . find the margin…

A:

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: search for the Ford Motor Company, you find that a random sample of 800 households includes 721 in…

A: At 98% confidence level, the z value is 2.33 which can be obtained by using the standard normal…

Q: When 328 college students are randomly selected and surveyed, it is found that 122 own a car. Find a…

A: From the provided information, Sample size (n) = 328 122 own a car that is x = 122 Confidence level…

Q: 2. In a survey of 1024 US adults, 287 said that their favorite sport to watch is football. a. Find a…

A: It is given that the survey contains 1024 US adults and the number of US adults who favorite sport…

Q: In a survey of 1,626,773 U.S. adults, 49,311 personally identified as lesbian, gay, bisexual, or…

A:

Q: Social Networking Sites In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of…

A: Given that Sample size (n)=2255 The number of US adults use internet regularly=1787 The number of US…

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

A:

Q: The figure to the right shows the results of a survey in which 1005 adults from Country​ A, 1023…

A: For the given data The99​%confidence interval for the proportion of adults from Country B who say…

Q: Of 266 employees selected randomly from one company, 13.53% of them commute by carpooling. Find the…

A:

Q: Assume a nationwide random survey of 800 adults asked about attitudes toward “alternative medicine”…

A: We have given that,  Sample size (n) = 800 and Favorable cases (X) =448 Then,  We will find the 99%…

Q: 1) In a four-year psychedelic-mushroom experiment, 93 of the 300 subjects reported experiencing…

A: It is given that:

Q: The figure to the right shows the results of a survey in which 1005 adults from Country​ A, 1023…

A: For the given data Construct a 99​% confidence interval for the population proportion of adults s…

Q: 3. Aresearcher wants to estimate the daily expenses of college students. He wants a 99% confidence…

A:

Q: Telemarketers obtain names and telephone numbers from several sources. To determine whether one…

A: From the provided information,

Q: Social Networking Sites In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of…

A: Solution: Given information: n= 2255 Sample size of US adults  x = 1787 US adults used internet…

Q: The principal randomly selected six students to take an aptitude test. Their scores were: 88.0 84.1…

A: Solution: Let X be the score. The given data is 88, 84.1, 74.9, 83.2, 83.7 and 85.5.

Q: survey of 40 students at a local college asks, "Where do you buy the majority of your books?" The…

A: The objective is to develop a 99% confidence interval estimate of the proportion of all of the…

Q: A school administrator wants to know what proportion of the approximately 80,000 teachers in their…

A: Given: x=55n=100

Q: 3: In a poll of 1000 likely voters, 560 say that the United States spends too little on fighting…

A:

Q: Pharmaceutical companies promote their prescription drugs using television advertising. In a survey…

A: Given data: Sample size = 80    x = 10 asked their  physician Confidence level  = 95%

Q: b. Construct a 90% confidence interval for the percentage of all judges who are in favor of the…

A: a. A random sample of 15 judges and asked them whether or not they favor the death penalty in which…

Q: The dean of students at a large college is interested in learning about their opinions regarding the…

A: Experiment is the study used to understand something about the population. In an experiment,…

Q: Of 380 randomly selected medical students, 21 said that they planned to work in a rural community.…

A: (a) From the Standard Normal Table, the z value for 99% level is 2.576. The sample proportion is,…

Q: Social Networking Sites Ina survey of 2255 randomly selected US adults (age 18 or older), 1787 of…

A:

Q: A recent survey of 1,000 people found that 90% of Americans support background checks for purchasing…

A:

Q: In a past presidential election, 36,523,493 people voted for Candidate A; 36,417,321 for Candidate…

A: The appropriate interpretation is to be made considering the proportion of votes for candidate A.

Q: b. In the year 2000, a survey of 894 U.S. adults were asked who they felt was the greatest…

A: Givenn=894x=194p^=xn=194894=0.2170Confidence interval = 99%

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.