In a random sample of 95 manufacturing firms, 67 indicated that their company attained ISO certification within the last two years. The confidence interval for the population proportion of companies that have been certified within the last 2 years is [0.59, 0.83]. In this case the confidence level is اختر أحد الخيارات a. 0.99% b. 98% C. 95% O d. 90%

Q: A 95% confidence interval for the proportion of cars on the road in the Germany that have automatic…

A: The 95% confidence interval for the proportion of cars on the road in the Country G that have…

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: A random sample of 120 adults showed that 42 are already fully vaccinated. Give a 95% confidence…

A:

Q: From a random sample of 64 high school seniors, the sample mean and standard deviation of the math…

A: The sample size is 64, sample mean is 96, and standard deviation is 16. The degrees of freedom is,…

Q: In a survey of 650 randomly selected U.S. males ages 18-64, 396 say they have gone to the dentist in…

A: Given,n=650x=396p^=xnp^=396650=0.6091-p^=1-0.609=0.391α=1-0.90=0.1α2=0.05Z0.05=1.645     (from…

Q: A survey of an urban university (population of 35,540) showed that 840 of 1,300 students sampled…

A: A survey of an urban university (population of 35,540) showed that 840 of 1,300 students sampled…

Q: A computer software magazine compares the rates of malware infection for computers protected by…

A: There are two independent samples which are software A and software B. Both samples are drawn from…

Q: A study of 420,055 cell phone users found that 137 of them developed cancer of the brain or nervous…

A: From the provided information, Sample size (n) = 420055 Out of which 133 developed cancer of the…

Q: A random sample of 5006 adults in a country includes 755 who do not use the Internet. Construct a…

A: Formula :

Q: A simple random sample of 300 branches out of a total of 1200 branches of a UK travel agency found…

A: Given : Here population is total branches of a UK travel agency  Population Size (N) = 1200 Sample…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Confidence interval provides an estimated range of the true value which tells about the population…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: It is given that margin of error (E) is 0.10 and the confidence level is 0.90.

Q: A New York Times/CBS News Poll asked a random sample of U.S. adults the question “Do you favor an…

A: From the provided information, Confidence level = 95% Confidence limit = (0.63, 0.69)

Q: In a random sample of 1500 BA major students who are graduating from the University of Western Cape…

A: The number of students in 1,500. The number of students who have already found a job is 1,350.

Q: A random sample of 240 adults over the age of 40 found that 144 would use an online dating service.…

A:

Q: The Graduate Schools take a random sample of recent MS graduates (n=135) and finds that 12 of these…

A: Givenn=135x=12confidence interval = 90%p^=xn=12135=0.0889α=1-0.90=0.10α2=0.05zc=zα2=z0.05=1.6449…

Q: A college admissions officer takes a simple random sample of 96 entering freshmen and computes their…

A: We have to find out lower confidence interval...

Q: In the past, 44% of those taking a public accounting qualifying exam have passed the exam on their…

A: Denote p as the true proportion of individuals to pass the exam on first try.

Q: In 2017, the CDC administered the Youth Risk Behavior Survey (YRBS) to a random sample of 14,795…

A: We have given that,  Favorable cases (X) = 2219 and sample size   (n) = 14795. Then,  We will find…

Q: A study of 420,053 cell phone users found that 130 of them developed cancer of the brain or nervous…

A: Here we need find the 90% confidence interval.

Q: A health insurance firm wants to estimate the proportion of a population that would receive the flu…

A:

Q: In a sample of 225 registered voters of City Unknown, 63 of 100 males and 59 of 125 females support…

A: Given  X1=63, n1=100, X2=59, n2=125

Q: In a survey of 1200 adults, 562 said that they plan to watch the next Olympics on television. Using…

A: Formula for calculating Margin of error :  ME=Zα/2 * √p̂(1-p̂)/n

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Solution:There is no estimates available, hence the sample proportion is assumed to be 0.50.The…

Q: The workers at a certain company took a random sample of 800 manhole covers and found that 40 of…

A:

Q: Identify the t-score for a 90% confidence interval if the sample size is 31. t =

A: c1=90%n=31α=1-0.90=0.10df=n-1=31-1=30

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: By the formula, margin of error denoted by u, u=z×p(1-p)n where z is the z score for 95% confidence…

Q: In a survey of 35 students at a local high school, 16 support changing the school's mascot. Find the…

A:

Q: A researcher constructed a 95 percent confidence interval for the mean number of alfalfa weevils on…

A: The 95% confidence interval for the population mean is (1.50, 3.50)

Q: The results of the National Health and Nutrition Examination Survey for the year 2011-12 found that…

A:

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: In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and…

A:

Q: In a recent poll of 1200 randomly selected adult office workers, 32% said they had worn a Halloween…

A: a. it is given that 32% said they had worn a Halloween costume to the office at least once. A sample…

Q: In a recent poll of 900 randomly selected adults, 37 % reported that they could not swim 24 yards…

A: Given information: In a poll of 900, randomly selected adults were examined if they could swim 24…

Q: A random sample of 64 bicycle-riding adults in Portland indicated that 24 always wore a helmet while…

A: Given, A random sample of 64 bicycle-riding adults in Portland indicated that 24 always wore a…

Q: b.Suppose a similar survey will be given to vaccine-eligible people in Canada by Canadian health…

A: Given data, p=0.5 E=0.02 z-value at 95% confidence is Zc=1.96 n=?

Q: In the week before and the week after a​ holiday, there were 10,000 total​ deaths, and 4984 of them…

A:

Q: In the past, 44% of those taking a public accounting qualifying exam have passed the exam on their…

A: Given: p=0.44 n=250 X: Passing on first attempt X=130 α=0.025

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

A: A random sample of 200 people from San Diego are considered in which 101 are found subscribed to…

Q: A certain article indicates that in a sample of 1,000 dog owners, 610 said that they take more…

A: Given: Sample size (n) = 1000 Number of owners who take more picture of their dog than their owner =…

Q: 4. A random sample of 64 bicycle-riding adults in Portland indicated that 24 always wore a helmet…

A:

Q: A corporation employs 148 sales representatives. A random sample of 60 of them was taken, and it was…

A: Given information: The volume of orders taken in a month were compared from the same month last…

Q: identify the t-score for a 90% confidence interval if the sample size is 31.        t=

A:

Q: Surveys were sent to a random sample of owners of all-wheel-drive (AWDAWD) vehicles and to a random…

A: Solution: State the hypotheses. Null hypothesis: That is, there is no difference in the proportion…

Q: In a random sample of 250 students who enrolled in Science, 150 took notes during classes. Find an…

A: Given that n=250,x =150,alpha =0.05 Find an approximate 95% confidence interval for the population…

Q: a random sample of 63, the proportion of the sample with a certain characteristic was 0.61. What is…

A:

Q: Let p equal the proportion of triathletes who suffered a training-related overuse injury during the…

A: Solution: It is given that out of 330 triathletes who responded to a survey, 167 indicated that they…

Q: In a certain state, a survey of 500 workers showed that 38% belonged to a union.  Find the 93%…

A: Computation of critical value: 1-α=0.93α=0.07α2=0.0351-α2=0.965 The critical value of z-distribution…

Q: % confidence interval for the true population

A: Given Data Sample Size, n = 31 Number of successes, x = 15.0 Significance level,…

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.