An online grocery company is researching the best location to start their new delivery service. They are comparing two local regions, A and B. In a random sample of 505 residents in region A, 26.1% said that they would use an online grocery store. In a random sample of 388 residents in region B, 29.5% said they would use an online grocery store. Find a 95% confidence interval for the difference in the proportions of residents in these two regions who would use an online grocery store. The CEO believes that region B will have a higher proportion of potential customers than region A. Does your confidence interval support that conclusion? Explain.

Q: According to a poll, 81% of California adults (409 out of 506 surveyed) feel that education is one…

A: Point estimate=0.81

Q: Several years ago, 50% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given claim: 50% of the parents who had children in grades K-12 were satisfied with the quality of…

Q: 25.  At a local college, 200 students were asked if they attended orientation. 112 said that they…

A:

Q: A 20-minute consumer survey mailed to 500 adults aged 25 to 34 included a $5 Starbucks gift…

A:

Q: The internal auditing staff of a local manufacturing company performs a sample audit each quarter to…

A:

Q: Several years ago, 33% of parents who had children in grades K-12 were satisfied with the quality of…

A: The formula for the confidence interval for the proportion is, Here, confidence level is 0.90. Use…

Q: Newborn babies are more likely to be boys than girls. A random sample found 13,573 boys were born…

A: The claim of the test is there is sample evidence that the birth of boys is more common than the…

Q: Cameron and Bailey each take random samples and construct 90% confidence intervals for the…

A:

Q: 99% confidence interval for the proportion of the high school students who have been cyberbullied,…

A: Given that Sample size n = 14795 Number of high school students who have cyberbullied, X = 2219 The…

Q: people in the age group 18-29 and 1500 people in the age group 30-55. The sample proportions of…

A: Given : Given : n1 = 1000 n2 = 1500 confidence level,c=0.95 Significance…

Q: A recent study randomly selected women from various countries around the world and collected…

A:

Q: 3. Researchers conducted a study of smartphone use among adults. A cell phone company claimed that…

A: Given Information: Male: Sample size (n1) = 1343 Sample proportion (p^1) = 10% = 0.10 Female: Sample…

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: The daily salaries of security guards for 10 security agencies are as follows: P350, P400, P375,…

A: Solution To find the point estimate we will find the sample mean.

Q: Identify the response variable and whether the sitting involved 1. A single sample, 2.Marched pairs,…

A: Disclaimer: Since you have asked multiple questions, we will solve the first question for you. If…

Q: improvement, two economists predicted no change, and four economists predicted a decline in the…

A: Here use one proportion z test

Q: According to a poll, 77% of California adults (389 out of 506 surveyed) feel that education is one…

A: Given that the number of favorable cases Favorable Cases XX = 389389 Sample Size NN = 506506…

Q: A researcher is interested in exploring the relationship between calcium intake and weight loss. Two…

A: n1=n2=28 X1-bar=15.2 X2-bar=12.3 S1=2.5 S2=1.9

Q: 6.24. Most desirable mates. A poll of 5000 residents in Brazil, Canada, China, France, Malaysia,…

A: We have given that,  Sample size (n) = 5000 and sample proportion (p̂) = 16% = 0.16  Then,  We will…

Q: . A sociologist develops a test to measure attitudes about public transportation, and 20 randomly…

A: Answer - A sociologist develops a test to measure attitudes about public transportation,…

Q: Two television stations have made efforts using profiles to promote the adoption of “forgotten”…

A: let X represents the Manufacture shock and Y represents the Competitor's shock. x y 8.8 8.4…

Q: There is not enough evidence to show that population proportion of adults that have never been…

A: Given data number of success , x= 250.0 sample size, n = 97 population…

Q: In a survey of 1007 parents of children ages 8 to 14, 75% say they are willing to get a second job…

A: Given information- A proportion of parents say they are willing to get a second job or part-time…

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: 6. The hospital would also like to estimate the Blue Shield as their insurance provider. A ra used…

A:

Q: Suppose a marriage counselor believes that the proportion of married couples with three personality…

A: The provided information are:

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

A: Given :-   randomly selects 200 students and finds that 118 of them are receiving financial aid…

Q: A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in New…

A: New…

Q: A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in…

A: given data

Q: The Vice-Chancellor of a university is concerned that illicit drug use on campus is higher than the…

A: In this case, the confidence level is 90%. The 90% confidence interval for the true proportion of…

Q: 10)The superintendent of a golf course believes that the mean score for professional golfers on his…

A: We have to find confidence interval for population mean. Since population standard deviation () now…

Q: Researchers are interested in the average heart rate of male college students. Assume a random…

A: Here, the sample proportion, p^ is 0.65 =130200 and the sample size, n  is 200. Using standard…

Q: A company surveyed its employees to determine what the new daily meal allotment dollar amount should…

A: would give the supervisor a better idea of what the true mean is compared to simply taking the mean…

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.