You sample 100 people to see if they have been to the grocery store in the past week, and find that 85% (.85) of them have been. What is the 95% confidence interval for this study? Leave your answer in decimal format to 2 decimal places. In other words, .04 instead of 3.6% or .11 instead of 11.4%.

Q: (a) What is the rat's sample proportion p? What is the large-sample 95% confidence interval for p?…

A: Given: Population size, n = 80 Sample size, x = 80 Sample proportion, p^: p^=8080=1

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: Campus athletics is interested in the proportion of registered students living on campus who play…

A: We are given that 95% confidence interval is correctly calculated from the given data as (0.12,…

Q: Della has over 500 songs on her mobile phone, and she wants to estimate what proportion of the songs…

A: The formula for the confidence interval is , CI=p^± Z*p^1-p^n Where,  p^=the proportion in sample…

Q: What is the margin of error if we find a 95% confidence interval for the percentage of Corvettes on…

A:

Q: 3. You want to find out the percent of people who use an iPhone, so you survey 120 random adults, of…

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

Q: A poll in which 567 American parents were asked the question, “Would you prefer to have your child…

A:

Q: For a 99% confidence level, what are the critical values for one-tailed test? Draw the figure.…

A:

Q: You have recently had a debate with a friend about who uses smartphones the most. Your friend…

A:

Q: If a 90% confidence interval for the mean is found to be (1.25,4.75) using a sample of n=100, find…

A:

Q: 1. In a recent poll 62 out of 149 randomly chosen students at Allen High School say they plan to buy…

A:

Q: how many people should you sample? 4 80 125 382 383

A: Given : Margin of error: ME = 0.05

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

A:

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

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: Gallup is a company that carries out daily opinion polls on a variety of topics. In a recent daily…

A: The confidence interval can be found by using the formula p±zp(1-p)n

Q: In a survey with human resources managers, 71% of respondents thought they should hire new staff…

A: Given information: Denote the population proportion of all respondents who thought that they should…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Solution:There is no estimates available, hence the sample proportion is assumed to be 0.50.The…

Q: In the 2004 presidential election, exit polls from the critical state of Ohio provided the following…

A: There are two independent samples which are Bush and Kerry. The sample size for both samples is…

Q: Using the accompanying colleges and universities data to find 95% confidence intervals for the…

A: Given:   Liberal Arts Colleges Research Universities 1169 1117 1194 1133 1204 1148 1210…

Q: Using the accompanying colleges and universities data to find 95% confidence intervals for the…

A: liberal arts colleges  reserch universities    1178 1105   1203 1148   1190 1152   1210…

Q: You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You…

A:

Q: Gallup Organization poll of n= 856 randomly selected American adults in October 2017 found that 60%…

A: Fkk

Q: 1. A recent (June 11,2018) Gallup poll found that 48% of Americans identify as pro-choice on the…

A:

Q: 2, A recent survey asked San Diego residents the following question: "If you had been aware that…

A:

Q: A research institute poll asked respondents if they felt vulnerable to identify a theft. In the poll…

A: Given,n=1000x=501p^=xnp^=5011000=0.5011-p^=1-0.501=0.499α=1-0.99=0.01α2=0.005Z0.005=2.58    (from…

Q: How do I input the following into Excel? You plan to conduct a survey to find what proportion of…

A: The confidence level is 95%. The margin of error is 0.02 Since the proportion is not known, p= 5/50…

Q: Gallup is a company that conducts daily opinion polls on a variety of topics. In a recent daily…

A: Given that, Sample size, n = 1000 38% of the sample said they were committed to their work.

Q: manager at ACME Equipment Sale and Rental wondered how offering a free two-year service warranty on…

A: a.  All necessary assumptions are met: The sampling method for each population is simple random…

Q: n our Condor Cafe, the Oxnard College Culinary Program offers the most delicious and affordable…

A: Given that, n=255,x=75

Q: In 2017, the CDC administered the Youth Risk Behavior Survey (YRBS) to a random sample of 14,795…

A: Obtain the 99% confidence interval for the proportion of the high school students have been cyber…

Q: An airline transports over 10 000 passengers daily, and the airline is curious what proportion of…

A:

Q: n 2013, the Gallup poll asked 1,039 American adults if they believe there was a conspiracy in the…

A: Given data, n=1039 x=634 sample proportion p=x/n =634/1039 =0.61   z-value at 90% confidence is…

Q: As the sample size gets smaller, what happens to the width of your confidence interval? O Wider /…

A: A confidence interval is an interval with a certain probability that a parameter will fall between…

Q: A random sample of accountants were asked whether they double-check their calculations on a tax…

A: Here the sample proportion is given by, p^ Therefore α level confidence interval is given by, p^ -…

Q: In a recent survey of US adults, 50 people were asked the question:   “Do you use a ride sharing…

A:

Q: Identify the t- scores for a 99% confidence interval if the sample size is 70?

A: We have to find critical value.

Q: Which of the below is the correct calculation of the 95¥% confidence interval?

A: Given that sample size n = 670 And sample proportion = 0.85 The critical value of Z at 95%…

Q: Suppose you want to construct an 80% confidence interval for the proportion of businesses that…

A: Given:Margin of Error (E)=3.5%=0.035   For Confidence level 80%, the significance level (α) is…

Q: You sample 100 people to see if they have been to the grocery store in the past week, and find that…

A:

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

A: Given: x=55n=100

Q: In a study of the nicotine patch, 21% of those who used the patch for 2 months reported no smoking…

A: Solution: It is given that, 21% of those who used the nicotine patch for 2 months reported no…

Q: 12. In a sample of 500 Canadians, 275 say they would rather retire in the US than in Canada.…

A: From the given information, Consider, X be the random variable that denotes the number of people who…

Q: Does your confidence interval capture 15 pounds? Answer this question in one sentence. If there…

A:

Q: 2. You are going to construct a 90% confidence interval for the proportion of adults that have a…

A: From the given information, let X be the number of adults that have a post-secondary education. The…

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

A:

Q: An airline transports over 10 000 passengers daily, and the airline is curious what proportion of…

A: Critical value: Using Excel formula "=NORM.S.INV(1-(0.1/2))", the z-value is obtained as 1.645.

Q: It was found that in a sample of 90 teenage boys, 70% of them have received speeding tickets. What…

A: Given data ,n=90P=70%=0.7The z-value at 90% confidence is1.645=z∝12=1.645

Q: what is the confidence coefficient of the following confidence levels? 99% Confident? 90%…

A:

Q: For one NBA playoff game the actual percentage of the television viewing public who watched the game…

A: Given information: PWatching the game=24%=24100=0.24n=50

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.