It is said that happy and healthy workers are efficient and productive. A company that manufactures exercising machines wanted to know the percentage of large companies that provide on-site health club facilities. A random sample of 240 such companies showed that 96 of them provide such facilities on site. a. What is the point estimate of the percentage of all such companies that provide such facilities on site?b. Construct a 97% confidence interval for the percentage of all such companies that provide such facilities on site. What is the margin of error for the estimate?

Q: (a) What is the rat's sample proportion p? What is the large-sample 95% confidence interval for p?…

A: Given: Population size, n = 80 Sample size, x = 80 Sample proportion, p^: p^=8080=1

Q: If a retailer would like to estimate the proportion of their customers who bought an item after…

A: Given data,     P=58%=0.58     E=7%=0.07     z-value at 95% confidence is  zc =1.98     n=?

Q: In your work for a real estate company, you find that in a sample of 1762 home buyers, 722 found…

A: Given Data: x=722 n=1762   p^=7221762=0.4098

Q: Construct the requested confidence interval. In a Gallup Poll of 1005 individuals, 452 thought they…

A:

Q: The research group asked the following question of individuals who earned in excess of​ $100,000 per…

A:

Q: When a survey asked subjects whether they would be willing to accept cuts in their standard of…

A: It is given that 362 out of 1,180 subjects respond yes.The sample proportion is 362/1,180 =…

Q: An organization advocating for health care reform has estimated the average cost for health care of…

A: Given : sample mean, x̄ = 13000  Margin of error , E = 1000

Q: An environmental science teacher at a high school with a large population of students wanted to…

A: The 95% confidence interval for the proportion of all students at the school who would respond yes…

Q: According to Scarborough Research, more than 85% of working adults commute by car. Of all U.S.…

A: Given that, According to Scarborough Research, more than 85% of working adults commute by car. Of…

Q: The research group asked the following question of individuals who earned in excess of $100,000 per…

A: The random variable percentage of who believe it is morally wrong for unwed women to have children…

Q: In order to estimate the proportion of entering students who graduate within six years, the…

A: Solution: Let X be the number of students who graduate within six years and n be the sample number…

Q: The figure to the right shows the results of a survey in which 1003 adults from Country A, 1024…

A: Given information For country A p-hat = 0.35 n = 1003

Q: The figure to the right shows the results of a survey in which 1015 adults from Country​ A, 1018…

A: The 99% confidence interval for population proportion is For 99% confidence, zc = 2.58

Q: Listed below are the amounts of net worth​ (in millions of​ dollars) of the ten wealthiest…

A:

Q: The production manager in an automobile plant is concerned with the number of cars that do not pass…

A:

Q: It can be said that healthy and happy workers are more productive and efficient. A company that…

A: Given Data Sample Size, n = 250 confidence level,c= 0.99 Significance level,…

Q: The figure to the right shows the results of a survey in which 1003 adults from Country A, 1024…

A: Given information For country A p-hat = 0.35 n = 1003

Q: 3. A random sample of 16 drinks from a soft drink machine has the following contents(ml): 250 280…

A: Given: Sample size n = 16 Population is Normally distributed. Population mean = mu= 275 Level of…

Q: In September 2011, Gallup surveyed 1,004 American adults and asked them whether they blamed Barack…

A: It is given that sample size (n) is 1004 and p-hat value is 0.53.

Q: The figure to the right shows the results of a survey in which 1005 adults from Country​ A, 1023…

A: From the provided information, Sample size of Country B (n) = 1023 Sample proportion (p̂) = 0.22…

Q: packer produces 1,200 packages of ham per shift, how many packages should the Quality Control area…

A: To find the confidence level of 95%.

Q: 1. The Hartford Insurance Company wants to estimate the percentage of drivers who change tapes or…

A: Please see the attachment..

Q: In a study of government financial aid for college​ students, it becomes necessary to estimate the…

A: Find z-critical value:…

Q: Mr. Thomas of Wilmer Amina Carter High School (a large urban high school) wants to know what…

A: given that,possible chances (x)=85size(n)=152success rate ( p )= x/n = 0.5592

Q: perimental treatments or medicines. The sample consisted of 1220 adult Internet users, and…

A: The value of z at 95% confidence level is 1.96, which can be found by using the standard normal…

Q: Suppose that a safety group surveyed 800 drivers. Among those​ surveyed, 83​% said that careless or…

A: Given Information :  Suppose that a safety group surveyed 800 drivers. Among those​ surveyed, 83​%…

Q: Refer to the data set of 20 randomly selected presidents given below. Treat the data as a sample and…

A: From the provided data set, it is clear that out of 20, 10 presidents were taller than their…

Q: 2. In a survey of 1024 US adults, 287 said that their favorite sport to watch is football. a. Find a…

A: It is given that the survey contains 1024 US adults and the number of US adults who favorite sport…

Q: In a study of government financial aid for college​ students, it becomes necessary to estimate the…

A:

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: manager at ACME Equipment Sale and Rental wondered how offering a free two-year service warranty on…

A: a.  All necessary assumptions are met: The sampling method for each population is simple random…

Q: A market analyst is curious what proportion of Los Angeles residents have a landline telephone. A…

A: Given that, A survey of 200 randomly selected Los Angeles residents shows that 96 of those selected…

Q: An environmental science teacher at a high school with a large population of students wanted to…

A: Given information: To obtain a potentially less biased estimate of the proportion, a statistics…

Q: An environmental science teacher at a high school with a large population of students wanted to…

A: Question : (b) Given the method used by the environmental science teacher to collect the responses,…

Q: The true proportion of c.c. students in her state, that receive an AD, is contained in that specific…

A: It is given that the confidence interval in b is calculated correctly.

Q: The figure to the right shows the results of a survey in which 1005 adults from Country​ A, 1023…

A: For the given data Construct a 99​% confidence interval for the population proportion of adults s…

Q: An evaluation team set out to survey the cost of malaria drugs in two urban areas. The following…

A: The prices of drug from a sample of drug shops in two towns are

Q: The following data represents the monthly cost for telephone service for a random sample of 8…

A: The data for a random sample of 8 households in Wilmington is provided which represents the monthly…

Q: How many subjects would be needed to ensure that a 95% confidence interval estimate of BMI had a…

A: Given data set is28,21,37,38,24,28,38,47,27,32,36,43sample size(n)=12confidence level=95%Margin of…

Q: Provide an explanation as to why it would be very unlikely that a different sample of size n=30…

A: Given: n=30

Q: In a study of government financial aid for college​ students, it becomes necessary to estimate the…

A: Assume sample proportion(p^)=0.5margin of error(E)=0.05α=1-0.99=0.01α2=0.005Z0.005=2.58    (from…

Q: The Universal Music Group is the music industry leader worldwide in sales according to the company…

A: The random variable music sales follow normal distribution. The sample size is 1003. The sample…

Q: In a study of government financial aid for college​ students, it becomes necessary to estimate the…

A: The required sample size is calculated by using the formula:

Q: A sample of part time students are asked how many hours per week they work on a job. For the…

A: There are only 5 values in the sample data. Scores: 18 13 12 15 12

Q: A psychologist has designed a psychotherapy programme for people suffering from obesity, and wanted…

A: Given, sample size, n = 13 For n<30, the 90% confidence interval for the mean…

Q: Suppose that a safety group surveyed 1,100 drivers. Among those​ surveyed, 65​% said that careless…

A: Obtain the confidence interval estimate for the true proportion in the population of all drivers who…

Q: A career counselor wants to understand if the average annual earnings differ by educational…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub- parts for…

Q: The figure to the right shows the results of a survey in which 1003 adults from Country A, 1024…

A: Given information For country A p-hat = 0.35 n = 1003

Q: The figure to the right shows the results of a survey in which 1003 adults from Country A, 1024…

A: Given information For country A p-hat = 0.35 n = 1003

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.