Sample size. A pollster wishes to estimate,with 95% confidence, the proportion of people who believe that police tactics need to be reviewed in the wake of deaths of unarmed black men at the hands of police in cities including Ferguson, Missouri and Staten Island, New York. Find the minimum sample size necessary to achieve a margin of error of less than 3% assuming no previous studies on the topic are available. Document how you computed the sample size in the space provided below.

Q: If you want a poll to have a margin of error of 2.84%, how large will your sample have to be?

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Q: A pollster wishes to estimate, with 99% confidence, the proportion of people who believe that recent…

A: Given data, E=2%=0.02 z-value at 99% confidence is Zc=2.576

Q: You wish to estimate, with 99% confidence, the proportion of all US adults who want more funding for…

A: Given data, E=4%=0.04 z-value at 99% confidence is Zc=2.576

Q: You work for NASA and are interested in determining the population proportion, with 99% confidence,…

A:

Q: You wish to estimate, with 90% confidence, the proportion of tablet owners who use their tablets…

A: Solution: 1. From the given information, confidence level is 0.90 and E=0.02. Since the proportion…

Q: You are running a political campaign and wish to estimate, with 95% confidence, the proportion of…

A: Formula for the sample size needed to estimate a population proportion is

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: (a) Critical value: Using the z-table, the critical value at 98% confidence level is  z0.022=2.326…

Q: 2. Let sample proportion . How large a sample should be taken to be 95 % sure that the error of…

A: As per our guidelines we are supposed to answer only one question per post. Given that, margin of…

Q: Why is a sample often a better way to obtain information about a population than a census? A. A…

A: Census:- In census,we collect our survey data from entire population.   Sample :- In sample ,we…

Q: Which statement is true? a. If the sampling plan is applied correctly there is no sampling risk b.…

A: attribute sampling - a statistical sampling plan used in test of controls. this is appropriate:…

Q: Which statement is true? larger sample sizes produce greater sampling error larger sample sizes…

A: Option c) is correct. greater sampling error produces greater margin of error

Q: You wish to estimate, with a 99% confidence, the population proportion (p) of U.S adults who made…

A: Given: Margin of error (E)=0.042Confidence level (c)=0.99α=1-c   =1-0.99    =0.01Area=1-α2…

Q: Solve for the sample size: Determine the sample size necessary to estimate the proportion of people…

A: The random variable time spent on shopping follows normal distribution. We have to find the sample…

Q: A researcher wants to calculate the prevalence of Alzheimer’s among members of a specific community…

A: Solution: Given information: Margin of error = E= 0.01 Population proportion = p = 0.1073 Confidence…

Q: If a population has a mean of 3.5, what is the mean of the sampling distribution if the sample size…

A: Given,sample size(n)=4population mean(μ)=3.5

Q: You are the operations manager for an airline and you are considering a higher fare level for…

A:

Q: . When an accurate and complete list of the population is not available, a sampling will suffer…

A: We want to tell you, which one is the correct choice.

Q: A pollster wishes to estimate, with 99% confidence, the proportion of people who believe that recent…

A: Introduction: The 100 (1 – α) % confidence interval for the population proportion, p is: Here, n is…

Q: Example 11.A company engaged in selling ballpoint pens wishes to estimate the proportion of people…

A:

Q: A sample of size 50 was drawn from a population that is not necessarily normally distributed. The…

A:

Q: In the Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests."…

A: Given information: Sample of 200 buses and find that 20 buses fail the safety inspection. Let us…

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Given Data: Margin of Error=0.22 p=0.54   z-value=1.96

Q: ample size always be 4, 5 or 6 -no smaller nd no larger? nswers to Conceptual Questions

A: It is an important part of statistics. It is widely used.

Q: Q. 60 What are the main differences between cluster sampling and stratified sampling?

A:

Q: a. An investigator decided to conduct a research to describe the average number of females in each…

A: Given that an investigator decided to conduct a research to describe the average number of female in…

Q: A poll in one country indicated that 48​% favor imposing the death penalty​ (the country currently…

A: Sample Size:The formula for the sample size is as follows:

Q: As Director of Student Services for the Lake County School District, you wish to estimate the…

A: X=35, n=50

Q: Results from the 2015 IPEDS Report indicate that about 1 out of 25 students at Mohawk Valley…

A: Given that  Results from the 2015 IPEDS Report indicate that about 1 out of 25 students at Mohawk…

Q: In preparing a report on the economy, we need to estimate the percentage of businesses that plan to…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is,

Q: A power analysis is a calculation used to estimate the smallest sample size needed for an…

A: 1)It is impossible to overstate the value of power analysis in an experiment. It is a vital tool for…

Q: Identify the kind of sample that is described. A salary committee for a Midwestern college sends an…

A: Given: A salary committee for a Midwestern college sends an email to all employees asking them to…

Q: If the population proportion is 0.7 . A researcher wants the margin of error to be 0.20 and the…

A: Given  pcap=0.7, Zcritical=1.96 at alpha=0.05 MOE=0.20

Q: IS IT REASONABLE TO ASSUME THIS SAMPLE CAME FROM A NORMAL POPULATION?

A: we need to answer, if it is reasonable to assume the given sample came from a normal population.

Q: A research poll included 1614randomly selected adults who were asked whether​ "global warming is a…

A: Given data,n=1614x=972point estimate p=?

Q: In a Gallup poll of 1236 adult respondents, 6% said that bad luck follows breaking a mirror. That…

A: The margin of error expresses the amount of the random variation underlying a survey's results