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: According to a poll, 81% of California adults (409 out of 506 surveyed) feel that education is one…

A: Point estimate=0.81

Q: In a survey of 3239 adults aged 57 through 85 years, it was found that 85.8% of them used at least…

A: Given : n=3239 p^=85.8%=0.858The formula for confidence interval for population proportion is…

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: 3. The following data represent the age (in weeks) at which babies first crawl based on a survey of…

A:

Q: and correlation analysis, in what scales of measurement must the variables be expressed?

A: Answer: In order to carry out simple linear regression, we need variety of dependent variables and…

Q: According to a Field Poll conducted February 8 – 17, 2005, 79% of California adults (actual results…

A: Solution

Q: a survey of 3088 adults aged 57 through 85​ years, it was found that 87.1​% of them used at least…

A: The formula for computing confidence interval is,  n is the sample size and P is the proportion.

Q: 1. A survey of 224 children of ages 9 to 17 was conducted shortly after 1986 space-shuttle disaster.…

A:

Q: n a survey of 500 students, 180 students said that they prefer classes on Mondays and Wednesdays…

A:

Q: . How many of the 3335 subjects used at least one prescription​ medication? b. Construct a​ 90%…

A: n = 3335 p = 0.804

Q: In a survey of 3110 adults aged 57 through 85 years, it was found that 87.9% of them used at least…

A:

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

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…

Q: 1. In a recent poll 62 out of 149 randomly chosen students at Allen High School say they plan to buy…

A:

Q: A group of researchers wants to estimate the true mean skidding distance along a new road in a…

A: Let x denoted the given data…

Q: . The following information is from the article College Students' Attitudes Toward UFOs, (College…

A: given data x = 10n = 18090% confidence interval for p.

Q: In a survey of 3015 adults aged 57 through 85 years, it was found that 85.6% of them used at least…

A:

Q: In a survey of 3115 adults aged 57 through 85​ years, it was found that 86.1​% of them used at…

A:

Q: A particular fruit's weights are normally distributed, with a mean of 477 grams and a standard…

A: Mean u = 477grams Standard deviation o = 14 grams P(477 < x < 491) = ?

Q: 5. The following data represent the repair cost for a low-impact collision in a simple random sample…

A: Let X be a repair cost for a low-impact collision.X is normally distributed..Want to construct a 98%…

Q: 4. Find a 99% confidence interval for the true proportion of cars that have V-shaped engines. Draw…

A: Given information: Consider the data that shows the Cars which have V-shaped engines. Car…

Q: people in the age group 18-29 and 1500 people in the age group 30-55. The sample proportions of…

A: Given : Given : n1 = 1000 n2 = 1500 confidence level,c=0.95 Significance…

Q: .

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

Q: A study of 420,078 cell phone users found that 132 of them developed cancer of the brain or nervous…

A: given that,possible chances (x)=132size(n)=420078success rate ( p )= x/n = 0.000314point of estimate…

Q: In a survey of 3473 adults aged 57 through 85​ years, it was found that 84.6% of them used at least…

A:

Q: The branch manager of an outlet store​ (Store 1) of a nationwide chain of pet supply stores wants to…

A: Comment: As per the our company guidelines we are supposed to answer only three subparts. Kindly…

Q: A food safety guideline is that the mercury in fish should be below 1 part per million (ppm). Listed…

A: Given, Sample size = 7   Since the population standard deviation is not known, use t-distribution to…

Q: Five fourth-grade children were selected at random from the entire class and timed in a short race.…

A: Given data : The times in seconds were 6.3, 4.2, 4.7, 6.0, and 5.7

Q: In a survey of 3393 adults aged 57 through 85​ years, it was found that 82.8​% of them used at least…

A: (a). Obtain the number of subjects who used at least one prescription medicine: It is given that…

Q: 1. Online News In a Harris poll of 2036 adults, 40% said that they prefer to get their news online.…

A: Given that the sample size is n=2036 and sample proportion, p^=0.40. Confidence level=95%…

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: Refer to the following scenario. An epidemiologist is worried about the prevalence of the flu in…

A: To find the sample size required for estimating the population proportion with a 95% confidence…

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

A:

Q: Find a 95% confidence interval for the proportion of the entire voter population who approve or…

A:

Q: The width of a confidence interval is a measure of its precision. The narrower the confidence…

A: Confidence interval

Q: In the past, 70% of a garage's business was with former patrons. Clarence Wade, the owner of the…

A: Solution: Given information: n= 600 Sample size  x = 432 Successes  p^=xn=432600= 0.72 Sample…

Q: II. The Dean of Arts and Sciences wants to evaluate student opinions on online courses. A small…

A: We have given that a small survey of 13 students asked them to rate their experiences online from 1…

Q: The data in the file represent egg and cheese symbolizes the total fat, in grams per serving, for a…

A: Given data is 7,8,3,5,15,21,22,24,18,33,23,31,25,19,29,29,29,30,41,55

Q: 5. Listed below are the values (in dollars) that a random sample of Americans spent on fast food per…

A:

Q: A study of 420,082 cell phone users found that 140 of them developed cancer of the brain or nervous…

A:

Q: The mean number of sick days an employee takes per year is believed to be about ten. Members of a…

A: x (x-xbar)^2 12 13.14063 4 19.14063 15 43.89063 3 28.89063 11 6.890625 8 0.140625 6…

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.