Suppose a senator finds that 45% of the United States voters are in favor of abolishing the Electoral College. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 3%?

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

A:

Q: In October 2017, the Gallup Poll asked a sample of 10281028 U.S. adults, "Are you in favor of the…

A: Margin of error: It is the vary of values below and higher than the sample data point in a…

Q: How many females and males of the sample have satisfying non- academic performance inspite of having…

A: Given information: Total population of first-year optometry students from DDC = 65 20% of the sample…

Q: The use of the Internet is constantly growing. How many randomly selected adults must be surveyed to…

A: Solution

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A: From the provided information, the hypothesis, that if two proportions, i.e., the proportion of…

Q: In a study to estimate the proportion of smokers among the residents in a certain city and its…

A: To testH0:p1=p2H1:p1≠p2

Q: A sample of n = 81 scores is obtained from a population with µ = 80 and σ = 27. If the sample mean…

A: Given that, Sample size, n = 81 Z score = +2.33 μ=80 and σ=27

Q: 2. A study found that 60 percent of college students say they are housing insecure, while 18 percent…

A: Given

Q: A researcher wishes to estimate the number of households with two types of vegetables in their…

A:

Q: A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. How large a…

A: Given,          Sample proportion  P∧=0.09          Margin of Error∈=0.04          and…

Q: Assume that half the population is vegetarian so that the chance of an individual being a vegetarian…

A:

Q: General Motors wants to know if a newly designed car has a different appeal to people under 30…

A:

Q: Among college students, the proportion p who say they're interested in their congressional…

A: The random variable interest rate follows normal distribution. We have to test whether the…

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

A: Givenconfidence level = 90%Margin of error(E)=2%=0.02p^=0.45

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

A:

Q: ate the proportion of households with two cars. How large a sample is needed in order to be 95%…

A: Following information is given: Confidence level = 95% Prior estimate of population proportion = 40%…

Q: Among college students, the proportion p who say they're interested in their congressional…

A: Given X=185 n=260

Q: A sample of n=24 is selected from a population = 120 and σ = 40.  If the sample mean is 130, what is…

A: It is given that the population mean, μ=120 and standard deviation, σ=40. For the sample size of 24,…

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: The manager of a fast-food restaurant wants to reduce the proportion of drive-thru customers who…

A: Given, P(Type II error)=0.14 Power is the probability of rejecting the null hypothesis when it is…

Q: You are conducting a study to see if the proportion of voters who prefer the Democratic candidate is…

A: given information: let us consider x : potential voters prefers the democratic candidate.…

Q: According to a recent report, 21% of all adults routinely skip breakfast. A researcher believes this…

A:

Q: It is believed that in the upcoming election, 65% of the voters in Baguio City will vote or…

A:

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

A:

Q: Among college students, the proportion p who say they’re interested in their congressional…

A: Given:  Among the college students the proportion p who say they’re interested in their…

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: Suppose that 20% of the residents in a certain state support an increase in the property tax. An…

A: Given info: Suppose 20% of the residents in a certain state support an increase in the property tax.…

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

A:

Q: Among college students, the proportion p who say they’re interested in their congressional…

A: Givensample size(n)=255x=172p^ =172255=0.675α=0.05

Q: Suppose a study revealed 46% of all subjects possessed trait A, 16% possessed both trait A and trait…

A: Solution

Q: A political campaign manager wishes to survey a number of voters to estimate the proportion of those…

A:

Q: Suppose a study revealed 63% of all subjects possessed trait A, 40% possessed trait B, and 21%…

A:

Q: “In a recent survey, 63% of decided voters said they would vote for the mayor in the next election.…

A: The confidence interval for population proportion is given by; p^-ME,p^+ME where, ME=zα/2p^(1-p^)n

Q: 4. Out of 450 randomly selected people in a soccer match, 225 of them were students. Compute the…

A: 450 people are selected randomly; n=450 225 of them were students; x=225

Q: Among college students, the proportion p who say they’re interested in their congressional…

A: From the provided information, Sample size (n) = 250 From which 180 students say they’re interested…

Q: The CEO of an airline estimates that 15% of all flights arrive late. How many flights must he…

A: Given Information: Proportion p=0.15 Confidence level = 96% = 0.96 Significance level α=1-0.96=0.04…

Q: A sample of n = 64 scores is selected from a population with µ = 80 and with σ = 24. On average, how…

A: Givenn=64μ=80σ=24

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: A poll in June 2020 found that 83% of American parents believe that virtual learning instead of in-…

A: Note: Since you have posted a question with multiple subparts, we will solve the first three…

Q: State the null hypothesis H0 and the alternative hypothesis H1 . H0: H1: (b) Determine the type of…

A: Given that  Sample size n =270 Favorable cases x =194 Sample proportion p^=x/n  =194/270 =0.7185…

Q: You are conducting a study to see if the proportion of voters who prefer the Democratic candidate is…

A:

Q: of 5,000 likely U.S. voters. You know that 25% of the voters are registered as Republican, 31% are…

A: NOTE: As per the guidelines provided to us, we are supposed to solve only 3 sub parts. As the…

Q: Suppose a study revealed 63% of all subjects possessed trait A, 31% possessed trait B, and 18%…

A: Solution

Q: You are conducting a study to see if the proportion of voters who prefer the Democratic candidate is…

A:

Q: Among college students, the proportion p who say they’re interested in their congressional…

A:

Q: If a manufacturer conducted a survey among randomly selected target market households and wanted to…

A: Given that, If the prior estimate is unknown, assume that the sample proportion is, Critical…

Q: Among college students, the proportion p who say they're interested in their congressional…

A: Givenx=173n=260p^=xn=173260=0.6654α=0.05

Q: A pollster wishes to estimate the proportion of United States voters who favor capital punishment.…

A: Given that, Critical value: Using the z-table, the critical value at 90% confidence level is

Q: You are conducting a study to see if the proportion of voters who prefer the Democratic candidate is…

A: Given: n = 89, x = 52, α = 0.05, p = 0.59. Sample proportion: p^=xn=5289=0.5843

Q: A random sample of 100 voters is taken to estimate the proportion of a state’s electorate in favor…

A: Here, the sample size is 100 and the proportion of a state’s electorate in favor of increasing the…

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.