In country​ A, the vast majority​ (90%) of companies in the chemical industry are ISO 14001 certified. The ISO 14001 is an international standard for environmental management systems. An environmental group wished to estimate the percentage of country​ B's chemical companies that are ISO 14001 certified. Of the 550 chemical companies​ sampled, 396 are certified. ​a) What proportion of the sample reported being​ certified? ​b) Create a 95​% confidence interval for the proportion of country​ B's chemical companies with ISO 14001 certification.​ (Be sure to check​ conditions.) Compare to the country A proportion.

Q: According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft,…

A: Given n=1750 X=436

Q: Construct a 95% confidence interval for the true proportion of all employees of Handy Glass Pty who…

A: A sample of 135 employees are considered out of which 75 employees are members of the company's…

Q: According to a report on sleep deprivation by the Centers for Disease Control and Prevention, the…

A:

Q: In a survey of 500 potential jurors, one study found that 350 were regular watchers of at least one…

A: It is given that sample size (n) is 500 and x is 350.

Q: The Indian River County Economic Development Board needs to estimate the proportion of all county…

A:

Q: According to a survey, 66% of all students in the U. S. own a laptop. For a simple random sample of…

A:

Q: According to a survey, 66% of all students in the U. S. own a laptop. For a simple random sample of…

A:

Q: A sociologist is interested in surveying workers in computer-related jobs to estimate the proportion…

A: The formula for the sample size is as follows: Here,zα/2 is the critical value at 95% confidence…

Q: 17. A researcher surveys 50 individuals in Smithville and 40 in Amherst, finding that 30% of…

A: State the hypotheses. That is, there is no evidence to conclude that the mobility rates in the two…

Q: 2. A national health organization warns that 30% of the middle school students nationwide have been…

A: Given : n = 110 X = 21

Q: uman resources managers, 71% of respondents felt they should hire new staff within the next three…

A: The Upper limit can be calculated as: Upper limit = Point estimate (sample proportion) + Margin of…

Q: 1. College Football PlayoffsAs of 2011, Division I college football in the US does not have a…

A:

Q: In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet…

A: We want to calculate the 90% confidence interval for each of the following proportions

Q: 9. The Centers for Disease Control and Prevention reported a survey of randomly selected Americans…

A:

Q: consider  a random sample of 300 students in a university,75 of them declared that they like playing…

A:

Q: A local health center noted that in a sample of 400 patients, 80 were referred to them by the local…

A: From the provided information, Sample size (n) = 400 From which 80 were referred to them by the…

Q: Of 380 randomly selected medical students, 210 said that they planned to work in a rural community.…

A: Solution: Let X be the number of medical students said that they planned to work in a rural…

Q: The St. Lucie County Economic Development Board needs to estimate the proportion of all county…

A: Sample Proportion p^\hat p = 0.193   a) Sample size, n = 254 Confidence interval = 0.97 Significance…

Q: Based on the results of a survey conducted by a group of researchers, the proportion of female…

A: Confidence interval is a process of inference which uses the sample statistics to find the range of…

Q: Estimate the fish population of Example 4.3.4, page 144, with a 68% confidence level.

A: GivenThe number of fish tagged t=150The sample size of fish caught  n=100The number of tagged fish…

Q: must prove that it has more than 25% of the viewing audience after its initial 13-week run in order…

A: The value of z at 99% confidence level is 2.575, which can be found by using the standard normal…

Q: 5, Randomly selected middle-aged people in both China and the United States were asked if they…

A: For China, n =1300 and x = 1170 therefore p^1 =11701300 = 0.9 For USA,  n = 150 and x =110 p^2…

Q: A Gallup poll of 1015 randomly selected adults found that 69% would oppose a law that limited the…

A: In question, Given that A Gallup poll of 1015 randomly selected adults found that 69% would oppose a…

Q: 1. Give a 90% confidence interval for the mean posttest score for all BACC students 2. Find a 95%…

A: The 90% CI is given by ​​​​​​​

Q: 1. A policeman believes that less than 40% of older drivers speed on highways, but a confidential…

A: The hypotheses can be constructed as: H0: p1 = 0.40 H1: p1 ≠ 0.40 Given: Sample size (n) = 88 Out of…

Q: population proportion, what is the 95% confidence interval estimating the proportion of businesses…

A: Given : Sample Size, n = 673 Number of successes, x = 384 confidence level,c=0.95

Q: In a sample of 95 recommendations, it is found that 56% of them made money. Determine the upper…

A: Proportion is almost similar to the concept of probability. Proportion is a fraction of population…

Q: A recent study suggested that 70% of all eligible voters will vote in the next presidential…

A:

Q: At a local college, an admissions officer surveys the incoming class of 1,000 first-year students…

A:

Q: construct a 95% confidence interval for the true proportion of the population having banking…

A: It ia given that Sample size n = 100 Number of persons having banking relations with either the…

Q: 1. Construct a 90% confidence interval that would contain the Rampo College population mean of…

A: Let xi ,(i=1,2,...n) be a random sample of n observations from a population involving a single…

Q: A local school board wants to determine the proportion of households in the district that would…

A:

Q: 1. A decision maker is interested in estimating a population proportion. A sample of size n = 150…

A: Given data,n=150x=115p=xn=115150=0.77z-value at 90% confidence is Zc=1.645

Q: 10. A quantity is measured using two different methods with results: x1 = (21.500 ± 0.078) and x2…

A:

Q: 9. Find the minimum sample size needed to be within a margin of error of 2% of the population…

A:

Q: The manager of a restaurant has to choose between two varieties of rice, A and B, and selects two…

A: The percentages of broken grains per kilogram for the variety of rice A and B  for two random…

Q: (a) The minimum sample size required to construct a 90% confidence interval is students. (Round up…

A: a) The given Data : Required margin of error = 1.31.3  Population standard deviation σ\sigma =…

Q: consider a random sample of 300 students in a university, 75 of them declared that they like playing…

A: A random sample of 300 students in a university in which 75 of them declared that they like playing…

Q: 2. Estimate the proportion of WCU students who have type B blood using 95% confidence interval.…

A: Given , n=100x=24p^=xn=24100=0.241-p^=1-0.24=0.76α=1-0.95=0.05α2=0.025Z0.025=1.96

Q: To find the proportion of San Diegans subscribed to Disney+ in 2019, a researcher randomly selected…

A: Given: p=population proportionp^=101200n=200α=0.05z=1.96

Q: The Indian River County Economic Development Board needs to estimate the proportion of all county…

A:

Q: 1. Construct a 90% confidence interval for the proportion of employees requiring size 3.

A: here given  A civil engineering firm issues every new employee with a safety helmet. Four different…

Q: 4. In a study of perception, 80 men are tested and 7 are found to have red/green color blindness.…

A:

Q: 2. A sample of 430 business applications included 150 men. Find the 99% confidence interval of the…

A: Answer:-  Given,  X=150 n=430

Q: In a sample of 159,949 First year college students, the National survey of student engagement…

A:

Q: In a poll of 500 voters in a campaign to eliminate non-returnable beverage containers, 350 of the…

A:

Q: In a survey of 500 potential jurors, one study found that 350 were regular watchers of at least one…

A:

Q: The St. Lucie County Economic Development Board needs to estimate the proportion of all county…

A: It is given that 19.3% of all county residents held at least a bachelor's degree. That is, p^=0.193.…

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.