A computer store near campus is stocking its shelves, and wants to know the relative proportions of UCI undergraduates who use PCs vs Macs. A random sample of 60 UCI undergraduates is surveyed, and each student is asked whether they use a PC or Mac more often. 55% select ”PC.”

Q: Isabel Myers was a pioneer in the study of personality types. According to one of her surveys, in a…

A: Solution

Q: In a 2017 survey was conducted on what was the best day of the week.  The result indicated that 90%…

A: Margin of error is given by, And Confidence interval for this study,

Q: Several years ago, 44% of parents who had children in grades K-12 were satisfied with the quality of…

A: The claim is that 44% of parents who had children in grades K-12 were satisfied with the quality of…

Q: A survey conducted on a certain website indicated that 52.9% of the people visiting this website…

A:

Q: An economist at the Florida Department of Labor and Employment needs to estimate the unemployment…

A: From the provided information,Confidence level = 90%, 95% and 97%

Q: Several years ago, 36% of parents who had children in grades K-12 were satisfied with the quality of…

A:

Q: Suppose that a random sample of 142 graduate-admissions personnel was asked what role scores on…

A: Given : Random sample of 142 graduate-admissions personnel Sample size (n)=142 Let X : No. of…

Q: You suspect minority students are not as supportive of the new principal of a large school because…

A: given n1=56, x1=45 n2=33, x2=21

Q: Public Policy Polling recently conducted a survey asking adults across the U.S. about music…

A: Given data  N = 571 X = 80 99% confidence interval

Q: 88% of California adults (444 out of 506 surveyed) feel that education is one of the top issues…

A: The value of z at a 90% confidence level is 1.645, which can be obtained by using the standard…

Q: Suppose that the a college wants to have an idea of the average SAT score of the incoming freshman…

A: The confidence level is 0.90, the standard deviation is 310 and margin of error E is 50.

Q: As Senior Class President, one of your lifelong duties is overseeing the planning of your high…

A:

Q: uman resources managers, 71% of respondents felt they should hire new staff within the next three…

A: The Upper limit can be calculated as: Upper limit = Point estimate (sample proportion) + Margin of…

Q: Kiyo is confused. He has constructed a 90% confidence interval for the average age of students at…

A: Answer: Given that:     Kiyo is confused. He has constructed a 90% confidence interval for the…

Q: A principal of a large high school wants to estimate the true proportion of high school students who…

A: Given information- Sample size, n = 50 For a random sample of 50 students, the 95% confidence…

Q: A poll of 827 students at Alpha state college found that 61% of those polled preferred a quarter…

A: It is given that the proportion of the students who preferred a quarter system to a trimester…

Q: A researcher wanted to check whether the percentage of Canadian adults with obesity has decreased in…

A: Number of Canadian adults in 2005= 75 Number of Canadian adults in 2009 = 120   significance level =…

Q: In a sample of 500 Canadians, 275 say they would rather retire in the US than in Canada. Calculate…

A:

Q: In 2010, the National Football league adopted new rules designed to limit head injuries. In a survey…

A: Given info: Here, n=2,096, p-cap=0.58 (=1216/2096) This is an Estimation problem. The method is…

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: The U.S. Census Bureau reported in 2002 that, for people 18-24 years old, the mean annual income for…

A: Given that ; For never married ; n1 = 100 Mean ( M1 )  = $ 21.539 For married couple : n2 = 100 Mean…

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: In a recent study, the Centers for Disease Control and Prevention reported that the diastolic blood…

A: μ=80.5,σ=9.9

Q: a newspaper article stated that the us supreme court received 812 letters from around the country on…

A: To find the 95% confidence interval for the true proportion of all American adults who feel that…

Q: What formulas are used to find the confidence interval? Researchers comparing the effectiveness of…

A: According to the given information in this questionWe need to construct 95% confidence interval

Q: According to a poll, 89% of California adults (450 out of 506 surveyed) feel that education is one…

A: Find a 90% confidence interval for the population proportion.

Q: The tobacco industry closely monitors all surveys that involve smoking. One survey showed that among…

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

Q: The researchers found that 53% of the women and 56% of the men believe that the U.S. federal…

A: In order to determine whether the difference between the proportions of women and men who believe…

Q: An economist at the Florida Department of Labor and Employment needs to estimate the unemployment…

A: Sample size n = 356 Sample proportion p^ = 0.029   Formula  Used: Confidence Interval = p^ ± Margin…

Q: This questions has multiple subparts. For your convenience, the description of the problem is…

A: 90% confidence interval for the difference between the true proportion of men and the proportion of…

Q: Several years ago, 44% of parents who had children in grades K-12 were satisfied with the quality of…

A: We have given that 44% of parents who had children in grades K-12 were satisfied with the quality of…

Q: Recent research commissioned by Vodafone suggests that older workers are the happiest employees (BBC…

A: Solution: Given information: n= 120 Sample size of worker  x = 68  worker feel fulfilled at work.…

Q: A survey conducted on a certain website indicated that 44.9% of the people visiting this website…

A: Given: proportion of people visiting website=44.9% margin of error=5%

Q: The Minneapolis Star Tribune (August 12, 2008) reported that 73% of Americans believe that Starbucks…

A:

Q: The police department wants to reduce the margin of error for their 95% confidence interval. If they…

A: Here Given  The police department wants to reduce the margin of error for their 95% confidence…

Q: A summary at the beginning of the report states "All drivers want some kind of workplace benefit."

A: Here given Students who participated in a UCLA Labor Summer Research Program in 2017 surveyed 260…

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

A:

Q: An economist at the Florida Department of Labor and Employment needs to estimate the unemployment…

A: Given data, p=2.4%=0.024 n=532

Q: Several years ago, 43% of parents who had children in grades K-12 were satisfied with the quality of…

A:

Q: n economist at the Florida Department of Labor and Employment needs to estimate the unemployment…

A: Given data,n=532proportion of residents were unemployed is p=2.4%=0.024

Q: A high school is running a campaign against the over-use of technology in teens. The committee…

A: sample size(n1)=200sample proportion()=0.85sample size(n2)=180sample proportion()=0.55confidence…

Q: Several years ago, 46% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given  p=0.46, n=1055, X=488

Q: several years ago, 48% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given that  Sample size n =1035 Favorable cases x =497 Sample proportion p^=x/n  =497/1035 =0.4802

Q: Come up with  your own data for a problem that would ask for a 90% confidence interval utilizing Z.…

A:

Q: According to a recent Government survey, 6% of all merchandise sold in the U.S. gets returned.  A…

A: It is given that sample size (n) is 80 and x is 12.

Q: A Gallup poll of 1487 adults showed that 43% of the respondents have Facebook pages.  Construct a…

A: Confidence Interval: In statistics, we can say a range of values of the specified population…

Q: university health services physician is concerned about how much sleep freshman are getting. She…

A: Given that She asked a simple random sample of 100 students if they got at least 8 hours of sleep…

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.