A study is to be made to estimate the proportion of residents of a certain city and its suburbs who favor the construction of a nuclear power plant near the city. How large a sample is needed if one wishes to be at least 90​% confident that the estimate is within 0.06 of the true proportion of residents who favor the construction of the nuclear power​ plant?

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

A:

Q: A random sample of 250 physicians shows that there are 40 of them who make at least $400,000 a year.…

A: We have to find value of test statistics.

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

A: Solution

Q: A sample of size 80 which found to contain 21 smokers. What is the sample proportion of non-smokers…

A: A population is the complete set of elements for which the study or experiment is conducted. A…

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

A: Given data, P1 = 21.9% = 0.219 P2 = 14.4% = 0.144 E = 2% = 0.02 Z= value at 95% confidence is Zc =…

Q: An optometrist wishes to know the proportion of patients who undergo laser eye surgery who end up…

A:

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: A researcher claims that the incidence of a certain type of cancer is less than 5%. To test his…

A: In this context, a researcher claimed that the proportion of incidence of particular type of cancer…

Q: According to an article in Marketing News, fewer checks are being written at the grocery store…

A: a)Null and alternative hypothesis Ho: There is no difference in the proportion of shoppers who pay…

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: 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: Suppose that in a large class, the instructor announces that the average grade on an exam is 75.…

A: According to the definition of estimation, a sample mean is equal to the population mean.

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: 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: In a random sample of 200 people who are looking for employment, it was found that 180 do not have…

A:

Q: Is the percentage of people who pay for Netlix accounts less than 75%? a. State your hypotheses. b.…

A: Note: Hi there! Thank you for posting the question. As your question has more than 3 parts, we have…

Q: Fifty people are selected randomly from a certain population and it is found that 12 people in the…

A: From the given information, There are 50 people and 12 people in the sample are over six feet tall.…

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

A: v

Q: From a sample of 500 items, 30 were found to be defective. The point estimate of the population…

A: The point estimate of the population proportion is the sample proportion. The formula for point…

Q: A company claims that 90% of its deliveries arrive on time. You take a sample of 74 deliveries, of…

A: Given,   The sample proportion is,

Q: The sample mean is found to be 1,150 hours. If the manufacturer's claim is correct, find the…

A: Given: μ=1200σ=400x¯=1150n=50 The probability of obtaining a sample with a sample mean of less than…

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

A: a) Compute the required sample size using the formula: E=zα2 p⏞11-p⏞1n+p⏞21-p⏞2n   Where 'E' is the…

Q: A recent survey estimated that 19 percent of all people living in a certain region regularly use…

A: The 100 (1 – α)% confidence interval provides an interval estimation of the required population…

Q: find the sample size needed to give , with 99% confidence, a margin of error within equal to 6% when…

A: Assume sample proportion(p^)=0.51-p^=1-0.5=0.5α=1-0.99=0.01α2=0.005Z0.005=2.58       (from Z-table)

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: If we assume that the above proportion is still true in 2021, how likely is it to find a random…

A: Obtain the probability that sample proportion is exceeding 0.11. The probability that sample…

Q: Suppose you wish to estimate a population mean based on a random sample of n observations, and prior…

A: The population standard deviation is 12.7, the margin of error is 1.6 and probability(or confidence…

Q: What sample size n is required in order to be 95% confident that our sample proportion is within…

A:

Q: What is the point estimate of the true proportion of people in the population who are over 6 feet…

A: Given that, Sample of 50 peoples is to be drawn and out of which 14 are possessing  characteristic…

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

A:

Q: A researcher selects all of the possible samples with n = 8 scores from a population and computes…

A: The mean of the sampling distribution of the sample mean is an unbiased estimator for population…

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

A: Percentage of level of confidence is 95%. Here, margin of error is, E=0.03.

Q: At a certain stage of a criminal investigation, the inspector in charge is 60 percent convinced of…

A:

Q: A state highway patrol official wishes to estimate the number of  legally intoxicated    drivers on…

A: It is given that margin of error (E) is 0.05 and the confidence level is 0.99.

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

A: Given: Confidence level = 0.95, margin of error = E = 0.08.

Q: A pollster wishes to estimate, with 95% confidence, the proportion of people who believe that recent…

A: a) Assume p-hat as 0.5, since no preliminary estimate is available.

Q: A random sample of 300 physicians shows that there are 50 of them who make at least $200,000 a year.…

A: Given,n=300x=50p^=xn=50300=0.1667H0:P=0.20H1:P<0.20

Q: . Suppose that the inside diameter of bulb lamp manufactured by a company are normally distributed…

A: Denote the random variable of interest here, the inside diameter of a randomly selected bulb lamp,…

Q: In a random sample of 500 teenagers 12 to 17 years old, it was found that 330 have regular access to…

A: A random sample of 500 teenagers 12 to 17 years old; n=500 It was found that 330 have regular access…

Q: A chi-square test is conducted to determine if a standard 6-sided die is weighted. If the die is to…

A: A standard 6 sided die is tossed randomly.

Q: 7. Suppose a researcher wants to estimate the difference in proportions of firstborn between the…

A: let us assume p^=0.5margin of error (E)=0.05α=1-0.90=0.1α2=0.05Z0.05=1.645

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: 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: Each year 7% of the world tiger population is killed by poachers. Now that there is a campaign to…

A: Given information: Population proportion, p=7%=0.07 Sample size is n=200

Q: Fifty people are selected randomly from a certain population and it is found that 12 people in the…

A: Sample size = n = 50 Sample number of events = x = 12 Sample proportion = p̂ = x/n = (12/50) =…

Q: Because of the popularity of movies as an entertainment medium for college students, you plan to do…

A: Solution: Given information: Population standard deviation= σ= $0.50   Margin of error = E= $0.25…

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

A: Given Error, E=±0.05CL=0.99

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.