A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 4​% of the true proportion. ​(a) No preliminary estimate is available. Find the minimum sample size needed. ​(b) Find the minimum sample size​ needed, using a prior study that found that 34​% of the respondents said they think Congress is doing a good or excellent job. ​(c) Compare the results from parts​ (a) and​ (b).

Q: A researcher wishes to​ estimate, with 99​% confidence, the population proportion of adults who…

A: a) p= 0.50

Q: A federal auditor for nationally chartered banks from a random sample of 100 accounts found that the…

A: Givensample size(n)=100Mean(μ)=RM 549.82

Q: A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of adults who…

A: (a) The estimate must be accurate within 4​% of the true proportion, 95% confidence and no…

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

A: Given information- Margin of error, E = 4.2% = 0.042 Confidence level, c = 99% a) Since no…

Q: quality conscious disc manufacturer wishes to know the fraction of disks his company makes which are…

A: Given Sample size =865 X=112

Q: What is the minimum sample size needed assuming that no prior information is available? (b) What is…

A: Given Significance level=0.1 E=0.02

Q: A marketing research firm wishes to conduct a poll in a certain region to estimate the proportion of…

A: Solution: From the given information, confidence level is 0.90 and E=0.03.

Q: A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of motor vehicle…

A: Here we need to find the sample size required in both the cases and compare the two results.

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: c = 95% E = 2% = 0.02 p^1=0.215p^2=0.195

Q: In a poll conducted by the General Social Survey, 81% of respondents said that their jobs were…

A: From the provided information, 81% of respondents said that their jobs were sometimes or always…

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: A polling agency wants to determine the percentage of voters in favor of extending tax cuts. They…

A:

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A:

Q: We are interested in conducting a study in order to determine what percentage of voters would vote…

A: Given that, If the prior information is unknown assume that the sample proportion  is 0.50 Critical…

Q: A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of adults who…

A:

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: A researcher wishes to​ estimate, with ​90%onfidence, the population proportion of adults who think…

A: Givenconfidence level(α)=90%Margin of error(E)=4%=0.04

Q: A researcher wishes to estimate, with 95% confidence, the population proportion of adults who…

A: It is given that margin of error (E) is 0.03 and the confidence level is 0.95.

Q: An employee survey conducted two years ago by a company found that 46% of its employees were…

A: v

Q: A researcher wishes to​ estimate, with 99​% ​confidence, the population proportion of motor vehicle…

A: The independent variable is motor vehicle fatalities that were caused by​alcohol-impaired driving.…

Q: A researcher wishes to estimate, with 90% confidence, the population proportion of motor vehicle…

A: Area on each tail for two-tail tests. Refer Standard normal table/Z-table OR use excel function…

Q: Find the minimum sample size required to estimate the proportion of the population that supports a…

A: From the given information,   Margin error = 0.042 Assume sample proportion = 0.5   The objective is…

Q: A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of adults who…

A: (a) The sample size is obtained below: From the given information, if the proportion value is…

Q: researcher wishes to estimate, with 99% confidence, the population proportion of adults who support…

A: It is given that Population proportion p = 0.72 Margin of error E = 0.02 Level of confidence = 99%…

Q: Suppose you would like to estimate, with 97% confidence, the proportion of computers that need…

A: It is given that the level of confidence is 97% and desired margin of error E is 0.035.The formula…

Q: A sociologist wishes to conduct a poll to estimate the percentage of Americans who favor affirmative…

A: From the given information, she wants to use a 2003 estimate of 55% obtained from a Gallup Youth…

Q: A pollster wishes to estimate, with 99% confidence, the proportion of people who approve of how…

A: From the provided information, Confidence level = 99% Margin of error = 0.03

Q: estimate the proportion of residents of a certain city and its suburbs who favor the construction of…

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

Q: A researcher wishes to estimate, with 99% confidence, the population proportion of motor vehicle…

A: Given that Margin of error, E = 3% = 0.03 Level of confidence = 99%. The critical value of Z at 99%…

Q: A researcher wishes to​ estimate, with 99​% ​confidence, the population proportion of adults who…

A: From the provided information, Confidence level = 99% Margin of error = 0.04

Q: In a random sample for 56 professional actors, it was found that 46 were extrovert.let p represent…

A: Given that in a random sample for 56 professional actors, it was found that 46 were extrovert. i.e.…

Q: A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of motor vehicle…

A: Given data,E=3%=0.03z-value at 95% confidence is Zc=1.96

Q: Aresearcher wishes to estimate, with 95% confidence, the population proportion of adults who think…

A: The random variable who thought Congress is doing a good or excellent job follows binomial…

Q: A researcher wishes to​ estimate, with 99​% confidence, the population proportion of motor vehicle…

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

Q: A researcher wishes to​ estimate, with 90​% confidence, the population proportion of adults who…

A: From the provided information, Margin of error (E) = 4% or 0.04 Confidence level = 90%

Q: A researcher wishes to​ estimate, with 90% ​confidence, the population proportion of adults who…

A: GivenMargin of Error(E)=0.02sample proportion(p^)=0.5α=1-0.90=0.10α2=0.05zα2=1.645

Q: A researcher wishes to​ estimate, with 90​% confidence, the population proportion of adults who…

A: Margin of Error = E = 0.05 Confidence Level = 90 Significance Level = α = (100-90)% = 0.1 α/2…

Q: A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of adults who…

A: Margin of error is the degree of error that could occur during the sample survey. It is calculated…

Q: A researcher wishes to estimate, with 90% confidence, the population proportion of adults who…

A: (a) The confidence level is 90%, margin of error is 0.07, and there is no prior information is…

Q: A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of adults who…

A: From the provided information, Margin of error (E) = 5% or 0.05 Confidence level = 95%

Q: 2007 survey of 980 American drives concluded that 38% of the driving population would be willing to…

A: Solution:  Given information: n= 980  Sample size  p^=0.38  Sample proportion E= 0.03 Margin of…

Q: A pollster wishes to estimate, with 90% confidence, the proportion of people who believe the United…

A: (1)   Obtain the minimum sample size with the no previous estimate.   The minimum sample size is…

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: From the given information, Margin error (E) = 0.03 Assume sample proportion = 0.5   The objective…

Q: A researcher wants to determine the percentage of American teenagers who send or receive text…

A:

Q: A researcher wishes to estimate, with 90% confidence, the population proportion of adults who think…

A: Given: ∝ = 0.10 E = 4% = 0.04 The Z-value for 90% confidence is 1.645. Part a: Let p = 0.5 The…

Q: At a certain college, it is estimated that fewer than 25% of the students have cars on campus. Does…

A: Given that,  H0: p= 0.25  H1: p=! 0.25 Sample size is n= 90 And x= 28 Proportion, P= x/n  = 28/90…

Q: A researcher wishes to estimate, with 95% confidence, the population proportion of adults who…

A: (a)   Obtain the minimum sample size needed.   The minimum sample size needed is obtained below as…

Q: A researcher wishes to​ estimate, with 99​% ​confidence, the population proportion of adults who…

A:

Q: A researcher wishes to​ estimate, with 99​% ​confidence, the population proportion of motor vehicle…

A: Solution: a. From the given information, confidence level is 0.99 and E=0.05.

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.