A sociologist is interested in surveying workers in computer-related jobs to estimate the proportion of such workers who have changed jobs within the past year.     In the absence of preliminary data, how large a sample must be taken to ensure that a 95% confidence interval will specify the proportion to within ±0.02? Round up the answer to the nearest integer.

Q: Out of a sample of 600 adults aged 18 to 30, 162 still lived with their parents. Based on this,…

A:

Q: A poll reported 30% support for a statewide election with a margin of error of 3.96 percentage…

A: Given  p^=30%, margin of error=e=3.96% , Level of the significance=0.05

Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…

A: Given information Error = 4% = 0.04 Confidence level = 0.95

Q: poll reported 41% support for a statewide election with a margin of error of 1.72 percentage points.…

A: We have given that  Population proportion p =41%=0.41 Margin of error =E =1.72%=0.0172 90%…

Q: A manager needs to know the proportion of employees who have insurance. He selects 200 employees and…

A:

Q: CareerBuilder took a random sample of 1,600 workers and found that 592 of them would put in their…

A: given data sample size (n) =1600favorable outcomes (x) = 59290% ci p.

Q: Suppose we wanted to estimate the average amount of sleep (in hours) a college student gets a night.…

A: Confidence interval : Confidence interval is a range of values it contains the true population…

Q: Example: construct 95% confidence interval for a population mean, if a sample of size 9 gave X = 13…

A: Given :X¯=13S=3n=9confidence level = 95%Level of significance :α=0.05The formula for confidence…

Q: The Centers for Disease Control reported the percentage of people 18 years of age and older who…

A: a) The sample size can be estimated as follows: n=ze2p(1-p)where, z = z scoree = errorp =…

Q: It's believed that as many as 24% of adults over 50 never graduated from high school. We wish to see…

A: Givenpopulation proportion(p)=0.24Margin of error(E)=0.02confidence level=95%

Q: alculate a 95% confidence interval for the difference between the proportions of Californians and…

A: Let p1 and p2 be the two population proportions for California and Oregonians who are…

Q: A study plans to investigate the average time a 18 year old spends playing video games each week.…

A:

Q: A random sample of 40 customers has an average order size of $78.25, and a population standard…

A: Given: Sample size = 40 Sample mean = 78.25 population standard deviation =22.50.  95% confidence…

Q: Refer to the sample data for pre-employment drug screening shown below. If one of the subjects is…

A: Positive test result drug use is indicated Negative test result drug use is not indicated…

Q: A Harris Poll survey of smokers in which 805 of a sample of 993 smokers agreed that smoking would…

A: Given: x=805n=993α=0.01

Q: Suppose that the a college wants to have an idea of the average SAT score of the incoming freshman…

A: The confidence level is 0.90, the standard deviation is 310 and margin of error E is 50.

Q: We are trying to estimate the average lifespan of all Neanderthal humans who lived 100,000 years…

A: Given: Sample of 56 skeletons from caves and construct a 95% confidence interval for their…

Q: Using the p-value method, we reject the null hypothesis if the p-value is ___________than or equal…

A: NOTE When p-value≤α=level of significance, then we reject the null hypothesis. When…

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A: The random variable flu follows binomial distribution. X ~ B (n, p). The sample size is 337. The…

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

A: Reviewing information, Group A p1=7.8%=0.078 n1=11506 Group B p2=9.1%=0.091 n2=4792

Q: An auditor wishes to estimate the mean value of accounts receivable in a total population of 1,120…

A: Given information: The population size, N=1120, and the margin of error is $4.

Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…

A:

Q: A history teacher records the SAT scores of all 87 of her students. The data is used to construct a…

A: For calculating the confidence interval, we need to satisfy the following conditions: Independence…

Q: .

A: It is given that 800 out of 1,000 students use Facebook during class.The sample proportion is…

Q: Suppose we were not told that 20% of M&Ms are blue by the company, but instead want to estimate this…

A:

Q: The Bureau of Alcohol, Tobacco, and Firearms (BATF) has been concerned about lead levels in…

A: Given, Range = 49 to 720 Margin of Error E = 10 at 90% confidence level  α = 0.1Critical value Zα2 =…

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: Construct a 99% confidence interval for the proportion of those aged 65 and over who have sleep…

A: Given

Q: The mean amount of the 812 mortgages taken out in a city in the past year must be estimated. Based…

A: Given : Population S.D (σ) = 20000 Confidence Level = 95% Margin of error (E) = 2000

Q: A New York Times article reported that a survey conducted in 2014 included 36,000​adults, with…

A: Given,According to the 2014 survey, proportion of success is p = 3.71% = 0.0371Confidence level, C =…

Q: The US Treasury found that a random sample of 1309 $20 bills found that 837 of them had trace…

A:

Q: 1. A professor is interested in how long the average biostat student studies per night, so he asked…

A: Given data:  n = 10 Data: 3, 4.5, 6, 5.5, 5, 4, 3, 2.5, 5, 3 hours.  Confidence level = 90%…

Q: A poll reported 37% support for a statewide election with a margin of error of 4.18 percentage…

A:

Q: igh school soccer league there are a total of 256 players.

A: Given that Total players in high school soccer league (n) = 256 players The mean height of the…

Q: From a random sample of 120 students, 95 rated a case of plagiarism as unethical. Using this…

A:

Q: What proportion of Law School applicants are accepted into Law School? In a survey of a random…

A: According to the given information in this question  We can say that the We are 95% confident the…

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

A: sample proportion 1 = 7.6% N1 = 11738 sample proportion 2 = 9.1% N2 = 4942

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

A: From the provided information,

Q: A poll for a statewide election has a margin of error of 3.59 percentage points. How many voters…

A: given data  E = 0.0359 90% ci for p  n = ?

Q: From a random sample of 120 students, 95 rated a case of plagiarism as unethical. Using this…

A: Compare the length from the formula to the length of given confidence interval.

Q: 90% confidence interval

A: a definition of what it means to be “90% confident”.   A 90% confidence level means that we would…

Q: roportion of adults in the city of Hawalli who are vegetarian. In a random sample of 13 adults from…

A: We have given that,  Sample size (n) = 713 and sample proportion (p̂) = 0.078 Then,  We will find…

Q: If 64% of a sample of 550 people leaving a shopping mall claims to have spent over $25 create and…

A: Given,   Sample size = 550 Sample proportion = 0.64   Critical value: Using z-table, the z-critical…

Q: Suppose that in a random sample of 600 employed Americans, there are 49 individuals who say that…

A:

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.