A recent study among 150 street hawkers in Cape Town showed that 48 of them are of the opinion that the local regulations obstruct their business. a) Construct and interpret a 95% confidence interval based on this sample.

Q: If a retailer would like to estimate the proportion of their customers who bought an item after…

A: Given data,     P=58%=0.58     E=7%=0.07     z-value at 95% confidence is  zc =1.98     n=?

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

A:

Q: Thirteen out of the 137 randomly selected faculty members who were surveyed at a community college…

A: Obtain the 90% confidence interval for the proportion of all faculty member at the community college…

Q: In your work for a real estate company, you find that in a sample of 1762 home buyers, 722 found…

A: Given Data: x=722 n=1762   p^=7221762=0.4098

Q: A computer software magazine compares the rates of malware infection for computers protected by…

A: There are two independent samples which are software A and software B. Both samples are drawn from…

Q: A Pew Research Center report on gamers and gaming estimated that 49% of U.S. adults play video games…

A:

Q: 3. A survey of 2,950 Filipinos showed that 2,655 trust the Supreme Court decisions on legal issues.…

A: Let X be the number of trust the supreme court decision on legal issues  n be the sample size  Given…

Q: A factory manager wishes to estimate the proportion of factory workers that use public…

A:

Q: The Pew Forum on Religion and Public Life reported on Dec. 9, 2009, that in a survey of 2003…

A:

Q: In a recent survey of 200 households, 172 had central air conditioning.  Find the 85% confidence…

A: Given that In a recent survey of 200 households, 172 had central air conditioning That is…

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

A: Sample proportion=p^=21380z=critical value for 95% confidence interval=1.96n=sample size=380

Q: Of 127 randomly selected adults, 31 were found to have high blood pressure. Construct a 95%…

A: Given that, Of 127 randomly selected adults, 31 were found to have high blood pressure.  X = 31 N =…

Q: A survey of 1010 college seniors working towards an undergraduate degree was conducted. Each student…

A: The provided information are:

Q: Of 58 bank customers depositing a check, 15 received some cash back.   (a) Construct a 90 percent…

A: (a) Obtain the 90% percent confidence interval for the proportion of all depositors who ask for cash…

Q: A company wants to know what proportion of their customers plan to repurchase their product in the…

A:

Q: In a recent poll, 560 people were asked if they liked dogs, and 22% said they did. Find the margin…

A: For 95% confidence intervalα=1-CI=1-0.95=0.05So, zα2=z0.052=z0.025=1.96

Q: Based on a sample of approximately 600 nonsmokers and 200 smokers, estimate the true difference…

A:

Q: The Pew Forum on Religion and Public Life reported on Dec. 9, 2009, that in a survey of 2003…

A: Given : Sample size(n)=2003sample proportion(p^)=0.25confidence level (c)=0.99α=1-c   =1-0.99…

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

A:

Q: A research report on a prospective study states that: “A comparison of the 90 normal patients with…

A: Contingency table and risk analysis

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

A: Given that 380 randomly selected medical​ students, 21 said that they planned to work in a rural…

Q: When a recent survey asked subjects whether it should or should not be the​ government's…

A: The total number of subjects that is sample size (n) = 1496The number of subjects who said yes that…

Q: In a recent poll, 150 people were asked if they liked dogs, and 55% said they did. Find the margin…

A:

Q: in a survey of 2230 adults, 57% thinks that land travel through a tourist bus is much more reliable…

A: Given,sample size(n)=2230sample proportion(p^)=0.57α=1-0.95=0.05α2=0.025Z0.025=1.96       (from…

Q: A medical researcher claims that smoking can result in the wrinkled skin around the eyes. The…

A: Given Information: Smokers: n1=150 x1=95 Nonsmokers: n2=250 x2=105 Confidence level is 95%

Q: Mr. Thomas of Wilmer Amina Carter High School (a large urban high school) wants to know what…

A: given that,possible chances (x)=85size(n)=152success rate ( p )= x/n = 0.5592

Q: In a poll of 2,500 likely voters, 966 say that the Philippines spend too little on education. Find…

A: Ans- Given the level of confidence interval   90 %                                        Then   α =…

Q: It was observed that 30 of the 100 randomly selected students smoked. Find the confidence interval…

A: It is given that, 30 out of 100 randomly selected students smoked i.e. proportion of the student who…

Q: From July 5-7, 2017, the Gallup Organization asked a random sample of 1,021 adults– aged 18 and…

A: From the information,  The sample proportion is, p^=59% The margin of error is, E=±4% The formula…

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

A: Given that, X = 118 N = 200 99% confidence level

Q: In a survey 800 randomly selected 16 to 18 years old living in USA were asked whether they have ever…

A:

Q: If 64% of a sample of 550 people leaving a shopping mall claims to have spent over $25 create and…

A: Given,   Sample size = 550 Sample proportion = 0.64   Critical value: Using z-table, the z-critical…

Q: Of 346 items tested, 22 are found to be defective. Construct the 98% confidence interval for the…

A: Solution: Let X be the number of items found to be defective and n be the sample number of items…

Q: Construct a 95% confidence interval for the population proportion of students who graduate within…

A: The sample size is n = 400 And the number of students who graduate within six years, X = 108 The…

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

A: From the provided information, Sample size (n) = 1024 Out of which 287 said that their favourite…

Q: thirteen out of the 147 randomly selected faculty members who were surveyed at a communty college…

A: Solution: Let X be the number of faculty members at the community college who know sign language and…

Q: 3. The Pew Internet and American Life Project conducted a poll between Oct 23 and Nov 19, 2006, in…

A: Given information X = 598, Sample size (n) = 935

Q: Of 57 bank customers depositing a check, 25 received some cash back. Construct a 90 percent…

A:

Q: Of 41 bank customers depositing a check, 25 received some cash back. (a) Construct a 90 percent…

A: of 41 bank customers depositing a check, 25 received some cash back.x=25 and n=41now, p^=xn=2541for…

Q: According to some car loan statistics, 44% of Americans are relying on an auto loan to pay for their…

A: Givenp^=0.44sample size(n)=1500confidence interval = 95%

Q: of 101 randomly selected mothers, 17% indicated that they pay for private preschool, what is the 99%…

A:

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: Do younger people use Twitter more often than older people? In a random sample of 316 adult Internet…

A:

Q: In a poll of 2,300 likely voters, 966 say that the Philippines spend too little on education. Find…

A: We have given that the sample size n = 2300, favourable cases X =966 and sample proportion p =…

Q: In a sample of 500 Canadians, 225 say they would rather retire in Florida than in Canada. Calculate…

A:

Q: The Associated Press (October 9, 2002) reported that in a survey of 4722 American youngsters aged 6…

A: Obtain the 99% confidence level for the proportion of all American youngsters who are seriously…

Q: 5. It is observed that randomly chosen 40 students out of 100 have a daily reading habit. Construct…

A:

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

A: Here we need to construct a 95% confidence interval for the population proportion. Here the sample…

Q: In a survey of 500 potential jurors, one study found that 350 were regular watchers of at least one…

A: