The following summaries of statistical studies give a sample statistic and a margin error. Find the confidence interval and answer any additional questions.    A Gallup poll found that 36% of Americans facor a law bannin the manufacture, sale, and possession of semi-automatic rifles (down from 60% in 2000). The margin of error was 4 percentage points. Is it reasonable to claim that one-third of Americans support such a law? Explain.

Q: A survey asked, "How important is it to you to buy products that are made in America?" Of the 600…

A: Given x=450 n=600

Q: A sample of n = 9 has s = 3.  What are the correct values for S.S. and s2? -SS = 81; sample…

A:

Q: Suppose that Mario owns a company that rents moving vans. Mario’s customers pay $22$22 per day to…

A:

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: Part a through d please. Thank you!

A: (a) Sample ProportionThe symbol "p̂" represents the sample proportion or the point estimate of the…

Q: Construct a 99.8% confidence interval for the proportion of women who work at home who are college…

A: Given,n=519x=165p^=xnp^=165519=0.318The point estimation for the proportion is 0.318 .

Q: A May 2000 Gallup poll found that 38% of a random sample of 1012 adults in the United States said…

A: (a)   Obtain the 96% confidence interval to estimate the true proportion of all U. S. adults who…

Q: . How many of the 3335 subjects used at least one prescription​ medication? b. Construct a​ 90%…

A: n = 3335 p = 0.804

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: malls were the exclusive focus of 10 percent of articles. The standard error of that proportion is 3…

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

Q: You're considering going to graduate school, and you would like to know how many people would…

A: From the provided information Sample size (n) = 29, People who recommend x = 9 The sample proportion…

Q: You plan to construct a 90% confidence interval for the proportion of all middle school students who…

A:

Q: It is known that ticks in York County carry the Lyme disease.  In a representative sample of 200…

A: Let n=sample size, X=number of Carry disease. p^=x/n  X=167, n=200

Q: Listed below are the amounts of net worth (in millions of dollars) of the ten wealthiest celebrities…

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…

Q: In statistics, what is a Confidence Interval and how confidence intervals are used in research

A: We have define the confidence interval . Also we have find the its use in the research

Q: In a survey, 13 people were asked how much they spent on their child's last birthday gift. The…

A: We have to construct ci.

Q: A survey asked, "How important is it to you to buy products that are made in America?" Of the 600…

A: Given x=450 n=600

Q: Suppose that a manager is interested in estimating the average amount of money customers spend in…

A: Given information 95% confidence interval is between $31.84 and $38.66 Confidence interval gives…

Q: A survey of 26 individuals found that they spent an average of $39.21 on exercise attire for the…

A: Confidence interval is an inference process which is used to estimate the population parameter. The…

Q: cording to a report in USAToday, more and more parents are helping ndom sample of 40 young adults…

A: The formula to construct confidence interval is, p^±Zα/2*p^(1-p^)n The formula for margin of error…

Q: At a large university in Conway, South Carolina, the Dean wants to know what proportion of students…

A: We have given thatn = 200x = 145Confidence level (c) = 99% = 0.99Significance level (α) = 1 - c =  1…

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

A: Givenx=722n=1762p^=7221762p^=0.4098α=1-0.98=0.02α2=0.01zc=z0.01=2.3263         (from z-table)

Q: The effectiveness of a weight loss program is to be evaluated by measuring the weight of eight…

A: Obtain the 95% confidence interval for the mean difference. The 95% confidence interval for the mean…

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

A:

Q: Several years ago, 42% of parents who had children in grades K-12 were satisfied with the quality of…

A:

Q: GROUP 2 You work for a consumer advocate ogency and want to find the mean repair cost of a washing…

A: According to the provided information, Mean (x̅) = 100 Standard deviation (σ) = 17.50 Sample size…

Q: In a survey of 3473 adults aged 57 through 85​ years, it was found that 84.6% of them used at least…

A:

Q: Ten different families are tested for the number of gallons of water a day they use before and after…

A: From the provided information, The difference between before and after are as follow: Before…

Q: You are trying to estimate the percent of people in California who have a college degree. You…

A: According to the given information in this question We need to identify that from the given…

Q: A statistics instructor randomly selected four bags of​ oranges, each bag labeled 10​ pounds, and…

A: Given X-bar=9.45 n=4

Q: A publishing company is studying the sales of various franchises in their chain of stores. A…

A: We are given confidence intervals for the population mean daily sales at 90%, 95%, 97% and 99%…

Q: In a survey of 3393 adults aged 57 through 85​ years, it was found that 82.8​% of them used at least…

A: (a). Obtain the number of subjects who used at least one prescription medicine: It is given that…

Q: n a survey, 25 people were asked how much they spent on their child's last birthday gift. The…

A: Givensample size(n)=25Mean(x)=38standard deviation(s)=19confidence interval(c)=98%

Q: A student organization conducted a statistical study to calculate a 95% confidence interval for the…

A: Hence,

Q: In general, when you increase the confidence level for a confidence interval using the same sample…

A: As confidence level increases critical value is going to increase .  Here they given sample…

Q: Ten students on a low-fat diet designed to lower their cholesterol and recorded their before and…

A: Let X represents the cholesterol level before diet and Y represents the cholesterol level after…

Q: A new survey found that out of a random sample of 300 high school students throughout the country…

A: From the provided information, Sample size (n) = 300 83% of them still planned on taking the…

Q: A sample of 1,000 employees in an international company was taken to estimate the average…

A: Confidence interval of mean is given by, (X bar + - Z* sigma/√n) Where X bar is mean and sigma is…

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

A: We have given thatn=571, X=80, C.I=99%=0.99

Q: Refer to the accompanying data set of 20 randomly selected presidents. Treat the data as a sample…

A: The provided information is as follows:The sample size for each sample is .The level of confidence…

Q: You are going to construct a 99% confidence interval for the proportion of hip replacement…

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: What Z score would be used to construct a 90% confidence level? Is it ... a. 1.65 b. 2.33 c.…

A: Confidence Level = 90 Significance Level = α = (100-90)% = 0.1 Critical value = z* = 1.65   […