A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 4 points with 99% confidence assuming s= 13.2 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? = Click the icon to view a partial table of critical values. A 99% confidence level requires 73 subjects. (Round up to the nearest subject.) A 90% confidence level requires subjects. (Round up to the nearest subject.)

Q: How big of a sample needs to be taken in order to estimate the proportion of children in a community…

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Q: Find the critical value for the population mean if there are 756 cats in a sample and you want a 91%…

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Q: SE 5: mpute for the sample size needed if the margin of error is 15, with sample standard iation of…

A: Case (5) We have given that  Sample standard deviation =43 Margin of error =E = 15 Sample standard…

Q: he number of square feet per house are normally distributed with an unknown population mean and…

A: Given information- Sample size, n = 33 Confidence level, C = 90% Significance level, α = 0.1 So,…

Q: An epidemiologist wants to estimate the proportion of patients who tested positive for the new…

A: Given: No. of patients, n= 300 No. of patients who tested positive for the new strain of virus, x=45…

Q: Find the margin of error at a 90% confidence level.

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Q: A laboratory tested 85 chicken eggs and found that the mean amount of cholesterol was 224 milligrams…

A: Given : n=85 , X-bar=224  , σ=16.6  , α=0.05 Since , the population standard deviation (σ) is known.…

Q: Find the critical value z α 2corresponding to a 86% confidence level.

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Q: The National Health and Nutrition Examination Survey is conducted each year and contains a variety…

A: There are two independent samples which are year 2003 and year 2018. Both samples come from…

Q: As we may all know, adults use credit cards for all sorts of reasons. A survey found that 66% of…

A: Find z-critical value: For the two-tail test, Area on each tail. Area to the left of the normal…

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

A: Assume p=0.5 and q=0.5, as the population proportion is unknown Here, margin of error e = 0.01 The…

Q: We wish to estimate what percent of adult residents in Ventura County like chocolate. Out of 500…

A: The sample proportion of the sample of size n can be defined as:  Here, X = Total number of success…

Q: A recent poll of 1001 Americans age 18 and over conducted in May of 2013 found that 80% of the…

A: Obtain the sample size. The formula of sample size is, Here, confidence level is 0.95.   Use EXCEL…

Q: A laboratory tested 25 chicken eggs and found that the mean amount of cholesterol was 225 milligrams…

A: Confidence interval when population standard deviation is not known:The formula of confidence…

Q: 829 adult were surveyed in one city, and 51% of them are opposed to the use of the photo-cop for…

A: Given data: n = 829 p = 0.51

Q: An internet service provider wishes to estimate, to within one percentage error, the current…

A: Given,margin of error(E)=0.01sample…

Q: A college dean would like to estimate a population mean to within 40 units with 99% confidence given…

A: Given Data: Margin of error (ME)=40 Confidence level=0.99 Population standard deviation (σ)=200   a)…

Q: A publishing company wants to make biology textbooks more affordable. Their marketing department…

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Q: According to a report on consumer fraud and identity theft, Indiana had 1671 complaints of identity…

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Q: The Pew Research Center conducted a survey of 45535 adults in 40 countries to learn about major…

A: From the provided information, Sample size (n) = 45535 Number of respondents who are very concerned…

Q: According to a 2018 survey of student loan debt incurred to finance undergraduate education, the…

A: Given:  X̅ = $25,786.74 σ=$9155.70 n = 1000

Q: We wish to estimate what percent of adult residents in a certain county are parents. Out of 500…

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Q: A study at Harvard found that 44% of their students binge drink. You are at Princeton doing a…

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Q: In a survey, 20 people were asked how much they spent on their child's last birthday gift. The…

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Q: A student conducted a study and reported that the 95% confidence interval for the population mean…

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Q: While it is an uncommon confidence level, find the critical value that corresponds to a confidence…

A: It is given that the confidence level is 0.822.

Q: A vet wants to determine the proportion of household pets that have pet insurance. What size sample…

A: Given that  Margin of error=E=0.06 ,  90% confidence

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

A: The random variable X follows binomial distribution. The margin of error is 0.01. The level of…

Q: Bhabhylhyn, a public health researcher, would like to estimate the proportion of hospitals which may…

A: Solution:- from given information the margin of error M.E.=4%=0.04 95% confidence level

Q: A researcher was commissioned to find out the proportion of students who use mobile phones in online…

A: Given: X=475N=500ME=0.01CI=0.99

Q: According to Thomson Financial, last year the majority of companies reporting profits had beaten…

A: Given, n(sample size)=162 x(fell short)=39 c(confidence interval)=95%

Q: The Center for Disease Control and Prevention (CDC) estimates that, on average, 5% to 20% of the…

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Q: From the data, identify the best point estimate of the population mean and 95% confidence interval…

A: We know that, The best point estimate of the population mean is sample mean .

Q: A previous random sample of 4000 U.S. Citizens yielded 2250 who are in favor of gun control…

A: Given, In a sample of 4000 out of which 2250 are gun control legislation. confidence = 0.9 margin of…

Q: We are interested in estimating the proportion of employees of a very large corporation who prefer…

A: Solution: From the given information, confidence level is 0.95 and E=0.03.

Q: In a survey of 3293 adults aged 57 through 85​ years, it was found that 80.8​% of them used at least…

A: Given Information Total adults(n) = 3293

Q: A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many…

A:

Q: Suppose you survey a random sample from a large population to understand the population proportion.…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Obtain…

Q: Samples of two different models of cars were selected, and the actual speed for each car was…

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Q: In a clinical test with 500 subjects, 2500 showed improvement from the treatment. find the margin of…

A: we have given that  sample size=N=2500 . , favorable cases =X=500 sample proportion…

Q: It is believed that 12% of Americans use a traditional antenna to watch network television. How…

A: Given that  Population proportion p=12%=0.12 Margin of error =E =2%=0.02

Q: Indentify the t-score for a 95% confidence interval if the sample size is 50 t=

A: Given n=20 CI=95%

Q: With data from the 2009 National Health Interview Survey, the Centers for Disease Control estimated…

A: The sample proportion is 0.12 and the standard error is 0.013.

Q: In a simple random sample of 1600 young​ people, 86​% had earned a high school diploma.   Complete…

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Q: An online poll of 810 adults found that 53% of the respondents think critical thinking should be…

A: Given info: An online poll of 810 adults found that 53% of the respondents think critical thinking…

Q: in this region to be 33 pounds. What sample size would you need to in order to estimate the mean…

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Q: Apply the t-interval procedure to find a 95% confidence interval for the mean arterial blood…

A: We want to find the 95% CI for population mean

Q: a laboratory tested 36 chicken eggs and found that the mean amount of the cholesterol was 230 mg…

A:

Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.