A researcher wants to do a study to see what the proportion of vaccinated people is in a certain area of New Jersey. How many people need to be polled to be with 2% of the actual population proportion with 95% confidence?

Q: 2. Given: n=80, a = 15, level of confidence is 92%. What is the margin of error of the given data?

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Q: How large a sample should be surveyed to estimate the true proportion of college students who surf…

A:

Q: The executives at Sandbachian, inc., having recently solved their widget crisis, have another…

A: Let ‘x’ be the no of defective manhole covers i.e x=40 and n=800 sample propotion (P)=x/n p=40/800…

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In poll,…

A:

Q: In a survey, people were asked whether they thought sun went around the planet Earth or vice versa.…

A: (a)   Obtain the proportion of people in the survey who believed the sun went around earth. The…

Q: An apple, 37% of the people polled answered yes to the question "are you in favor of the death…

A: The provided information is: Sample proportionsp^=0.37 Margin of errorE=0.03 Level of…

Q: You take a random sample of size 25 students and find the 5 who understand this lecture. With 99%…

A:

Q: Find the margin of error if the sample proportion is 0.37 and the sample size is 300. on Consider…

A: Margin of error is the error due to random sampling. The margin of error decreases with increase in…

Q: A magazine provided results from a poll of 500 adults who were asked to identify their favorite pie.…

A: GivenA poll of 500 adults asked to identify .among them 11% choose chocololate pie and the margin of…

Q: Thirty five percent of adults Americans are regular voters.  A random sample of 250 adults in a…

A: Confidence interval:The (1-α) % confidence interval for proportion p is given by,

Q: I want a 99% confidence within 2% for the true proportion of bald people in the US.  How many people…

A: Given that, Margin of error E=0.02 Confidence level is 99% Critical value: The two tailed z critical…

Q: A researcher wishes to estimate the number of households with two cars. How large a sample is needed…

A:

Q: During routine screening, a doctor notices that 20% of her adult patients show higher than normal…

A: Obtain the sample size of a preliminary estimate for p is 0.20 with the 95% confidence. The formula…

Q: Use z =2.576 If the margin of error for the population mean for 99% Confidence Level is 39, what…

A:

Q: A researcher wishes to estimate the number of households with two computers. How large a sample is…

A: given data   CI = 0.90, P ( - Z< P < Z ) = 0.90 therefore z = 1.645 ( =z table ) E = 6% =…

Q: A Plitical pollster wants to know what proportion of voters think james burger should go away and…

A:

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

A: Solution: From the given information, confidence level is 0.96, p=0.54 and E=0.02.

Q: A researcher wishes to be 95% confidence that her estimate of the true proportion of individuals who…

A: Given that  Confidence level (C) = 95%  The true proportion of individuals who travel overseas is…

Q: If the candidate only wants a 6% margin of error at a 99% confidence lev

A: Given that, The margin of error (E) is 0.06. Assume that p as 0.5.

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

A:

Q: Explain the meaning of a poll that says 55% of Americans approve of the job the president is doing,…

A: According to the given information, a poll that says 55% of Americans approve of the president's…

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

A: compute sample size ( n ) = n=(Z/E)^2*p*(1-p)

Q: a pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…

A: Given P=0.09 E=0.06 Z(0.01)=2.33

Q: If the Census wants to increase its level of confidence and keep the error bound the same by taking…

A: Given information: The census wishes to increase the level of confidence (c). The error bound (MoE)…

Q: A newspaper reported the results of a political poll about which candidate likely voters preferred,…

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

Q: You have been hired by a consortium of local car dealers to conduct a survey about the purchases of…

A: Given: Confidence level = 95% Margin of error = 0.03 Formula Used: n = ZαMargin of error2 p(1-p)

Q: As the newly hired manager of a company that provides cell phone service, you want to determine the…

A: When we don't have any prior information about the population proportion, we generally take it as…

Q: A magazine provided results from a poll of 1000 adults who were asked to identify their favorite…

A: Given Information :  A magazine provided results from a poll of 1000 adults who were asked to…

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: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…

A:

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the​ poll,…

A:

Q: Suppose we have the results of a Gallup survey (simple random sampling) which asks participants for…

A:

Q: If n=14, (x-bar)-33, and s=9, find the margin of error at a 98% confidence level Give your answer to…

A: We have given that, Sample mean (x̄) = 33, standard deviation (s)= 9 and sample size (n) = 14  Then,…

Q: In a poll, 51% of the people polled answered yes to the question "Are you in favor of the death…

A: Given that: p= the probability of getting a person who answered yes to the question "Are you in…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Solution: From the given information, confidence level is 0.99, p=0.25 and E=0.03.

Q: A magazine provided results from a poll of 2000 adults who were asked to identify their favorite…

A: Given: A magazine provided results from a poll of 200 adults who were asked to identify their…

Q: 4) Out of the 440 people surveyed, a 110 said they listen to Spotify at least one a month. With the…

A:

Q: A magazine provided results from a poll of 500 adults who were asked to identify their favorite pie.…

A: From the given information, The percentage of chocolate pie is 14%. There are 500 respondents.…

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: A public opinion pollster wants to estimate the percentage of voters who favor an upcoming proposal.…

A:

Q: d. University administrators would like to conduct a new survey in May to update this estimate. They…

A: Given: Margin of error (E) = 2.25% = 0.0225 Confidence level = 98% The estimate from the previous…

Q: A pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…

A: From the provided information, Study indicates that proportion of left-handed scientists is 9% that…

Q: in a poll 51% of people polled answered yes to the question Are you in favor of the death penalty…

A: Given, p=0.51 M.E=0.02 α=1-0.94=0.06 As per z-distribution table, the critical value of z at 0.06…

Q: A Verizon researcher compared the number of text messages sent by a sample of teenage boys to the…

A: a) In this case, the Verizon researcher compared the number of text messages sent by a sample of…

Q: Through polling, it was estimated that the percent of people who will vote for a particular…

A: Given information Percentage of people who will vote in a upcoming election p-hat = 36.2% Margin of…

Q: A magazine provided results from a poll of 1500 adults who were asked to identify their favorite…

A: The probability of people choose chocolate pie is 0.13.

Q: The manager of a small supermarket chain wants to estimate the proportion of time stockclerks spend…

A: Assume that the population proportion is 0.5. It is known that the critical value for 98% confidence…

Q: If 390 people were asked if they liked dogs, and 82% said they did What is the margin of error of…

A: The sample size is 390, proportion is 0.82. Computation of critical value:…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.