The National Weight Control Registry tries to mine secrets of success from people who lost at least 30 pounds and kept it off for at least a year. It reports that out of 2,720 registrants, 439 were on a low-carbohydrate diet (less than 90 grams a day). a. Develop a 95% confidence interval for the proportion of people on a low-carbohydrate diet.b. Is it possible that the population percentage is 16%? c. How large a sample is needed to estimate the proportion within 0.55%?

Q: We are interested in comparing the percentage of females versus males who expect their future to be…

A:

Q: An auditor wants to estimate the mean value of a corporation's accounts receivable. The population…

A: Given that: Strata Population Size Estimated Standard Deviation ($) 1 500 150 2…

Q: From a simple random sample of 400 of the 1,395 colleges in our population, it was found that…

A: Given : 1395 colleges in our population  Population Size (N) = 1395 400 colleges selected randomly…

Q: 88% of California adults (444 out of 506 surveyed) feel that education is one of the top issues…

A: The value of z at a 90% confidence level is 1.645, which can be obtained by using the standard…

Q: Ten years ago, according to government records, 17% of the population of Elmwood had no health…

A:

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: 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: Example: Compute the 90%, 95%, and 99% confidence intervals for the population mean credit card…

A: The summary statistics for the population mean credit card balances is provided as; The confidence…

Q: In one community, a random sample of 25 foreclosed homes sold for an average of $443,776 with a…

A: From the provided information,Standard deviation (s) = 196739Sample mean (x̄) = 443776Sample size…

Q: If n=12, =49, and s=8, construct a confidence interval at a 80% confidence level. Assume the data…

A:

Q: All residents of Homer Glen, IL (N = 21,000). You want to estimate the mean age of each population…

A: Sample size n=7595% confidence level.

Q: Department of Licensing show that 47 former SFCC business students have incorporated their own…

A: Given data : 7, 12, 13, 17, 10, 5, 10, and 6 employees

Q: When you construct a confidence interval for the difference between two proportions, what do you use…

A: What is the unbiased estimate of the difference between two proportions? What is the formula for…

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: We are interested in comparing the percentage of females versus males who expect their future to be…

A: Summarising the given information below. The number of total surveyed females and males:…

Q: If α = 0.05, then what is the confidence level?

A: Given: α = 0.05   we know that, Confidence level+ α = 1

Q: Construct a 99% confidence interval to assess whether this represents evidence that parents'…

A:

Q: According to the Centers for Disease Control and Prevention, 33.5% of U.S. adults have high LDL, or…

A: The population proportion of US adults having high LDL: Number of sampled adults :In the given…

Q: 1. Construct a 95% confidence interval to estimate the proportion of Wingate male students that are…

A: total number of male students =126 number of students who are left handed=17

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

A:

Q: In order to estimate the percentage of adults who file their taxes at least two weeks before the…

A: The given 95% confidence interval is, 0.759 to 0.841 The values of sample proportion and margin of…

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

A: The formula of sample size is, Use EXCEL Procedure for finding the critical value of z.   Follow…

Q: What is stated by the alternative hypothesis (H1) for an ANOVA? ​a. There are no differences…

A: We have given that the statement about to the alternative hypothesis of ANOVA.

Q: A publishing company is studying the sales of various franchises in their chain of stores. A…

A: We are given confidence intervals for the population mean daily sales at 90%, 95%, 97% and 99%…

Q: Records from the Washington Department of Licensing show that 47 former SFCC business students have…

A: Given data is 7 , 12 , 13, 17, 10, 5 , 10 , 6sample size(n)=8

Q: In order to estimate the percentage of adults who file their taxes at least two weeks before the…

A:

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: Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You…

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Q: What proportion of OSU students earn their undergraduate degrees in four years? A college…

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Q: The clinical testing of drugs involves many factors. For example, patients that have been given…

A: Percentage = 100*Proportion We are given only one sample of size n=500, so we will not be using two…

Q: Your state is considering raising the legal age for consumption of alcoholic beverages to 21 years…

A: p = 0.5 Margin of error = 0.01

Q: The police department wants to reduce the margin of error for their 95% confidence interval. If they…

A: Here Given  The police department wants to reduce the margin of error for their 95% confidence…

Q: In general, would you expect a 90% confidence interval on μ to be longer or shorter than a 95%…

A: Given It is given that the sample is same and CL is increased from 90% to 95%.

Q: Market research indicates that a new product has the potential to make the company an additional…

A: It is given that,Sample mean = $3.8 million.Sample standard deviation, s is $1.8 million.The sample…

Q: According to the Centers for Disease Control and Prevention, 33.5% of U.S. adults have high LDL, or…

A: The hypothesized percentage (or proportion) of US adults with LDL, p0=33.5%.The sample size, i.e.,…

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

A: Sample size(n)=10sample mean(x¯)=171standard deviation(s)=33.79020degrees of…

Q: registered. Construct a 90% confidence interval for the proportion of first-time visitors who saw…

A: Let p be the population proportion of first-time visitors who saw the new design that registered.…

Q: Out of a 54 person sample from our fall Math-150 classes, 12.4% of the students are left-handed.…

A: Given information: n=54p^=0.124x=54×0.124x=6.696Confidence level=80%

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

A: From the provided information,

Q: You do a study of hypnotherapy to determine how effective it is in increasing the number of hours of…

A: The data shows the hours of sleep for 12 subjects.

Q: The    Bureau    of    Labor    Statistics    reports    the    previous    month’s    unemployment…

A: Sample proportion Given information Sample size (n) = 60,000 p̂ = 0.079

Q: In a survey of 3213 adults aged 57 through 85​ years, it was found that 83.9​% of them used at…

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.