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: A federal report indicated that 22% of children ages 2 to 5 years had a good diet, an increase over…

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Q: 4. The World Health Organization reports that in a sample of 10,013 people globally, 9 in 31 people…

A: We know, we calculate CI for a single proportion with the formula z*=1.96 for 95%          1.645 for…

Q: In a sample of 225 college seniors, 189 responded positively when asked if they have spring fever.…

A: Obtain the 95% confidence interval for the proportion of all college seniors who have spring fever.…

Q: 25 people were surveyed and 60% of them are in favor of to the used of street cameras issuing…

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

Q: eth wants to determine a 90 percent confidence interval for the true proportion of high school…

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Q: The National Weight Control Registry tries to mine secrets of success from people who lost at least…

A: Given - Sample size, n = 2720 Number of registrants on a low-carb diet,X = 439 Proportion of…

Q: When using a one-sample z-procedure to construct a confidence interval for the proportion of a…

A: When using a one sample z procedure to construct a confidence interval for the proportion of 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: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A: If both the expected number of success and expected number of failures are greater or equal to 10,…

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

A: Given data isn=332x=36p^=xn=36332=0.108434Margin og error(E)=0.04Confidence level=95%

Q: Given a sample of size n=20 and the sample mean of 10 and a standard deviation of 3, find the…

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Q: The National Weight Control Registry tries to mine secrets of success from people who lost at least…

A: X: People on a low-carbohydrate diet. X=439 n=2720

Q: A survey at a certain university found that 21 out of a random sample of 350 students had over…

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Q: A researcher estimates the 90% CI for a sample with a mean of M = 8.9 and a standard error (sM) of…

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Q: In a survey, the planning value for the population proportions P* = 0.5. How large a sample should…

A: Given,population proportions (p*)=0.5margin of error (E)=0.04α=1-0.90=0.1α2=0.05Z0.05=1.645  (from…

Q: A random sample of 240 adults over the age of 40 found that 144 would use an online dating service.…

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Q: A simple random sample of size n is drawn. The sample​ mean, x​,is found to be 17.7​, and the sample…

A: We have to construct ci from given data.

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

A: Proportion = p =40/334 = 0.119760479041916 Margin of Error = E = 0.04 Confidence Level = 95…

Q: monitoring lead in the air after an explosion at a battery factory, it is found that the amount of…

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

A:

Q: A simple random sample of size n is drawn. The sample​ mean, x​,is found to be 17.7​, and the sample…

A:

Q: an epidemiologist is womied about the prevalence of the flu in East Vancouver and the potential…

A: Given data, n=331 x=33 E=0.05 z-value at 95% confidence is Zc=1.960 n=?   p=x/n=33/331=0.0997

Q: A random sample of 25 college males was obtained and each was asked to report their actual height…

A: a) Given CI is 0.8 and 2.2, hence the null hypothesis that can be rejected is-  H0:μd=0.5, since 0.5…

Q: The body mass index (BMI) was measured in 1200 randomly selected adults, with the results shown in…

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Q: "Athletes at major colleges graduated, on the whole, at virtually the same rate as other students."…

A: a. The best point estimate of the population proportion is the sample proportion. It was found that…

Q: The conservative sample size required for a 95 percent confidence interval for π with an error of…

A: Given: Confidence level = 0.95 So, α=1-0.95=0.05 The confidence interval is two sided. Margin of…

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

A: The known values are, The sample proportion is, Critical values: Using the z-table, the critical…

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

A:

Q: Give the margin of error for the 90% confidence interval for µd = µ1 – H2

A: The differences are 4, 6, 2. The mean is, d¯=∑dn=4+6+23=123=4 The standard deviation is,…

Q: Find a​ 95% confidence interval for the true population proportion. Round values to the nearest…

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Q: In exploring possible sites for a convenience store in a large neighborhood, the retail chain wants…

A: Solution  To find solution we will use conservative estimate of people.

Q: The following confidence interval is obtained from a population proportion, p: 0.883 < p < 0.911…

A: We know that the confidence interval formula is: Here E=Margin of error   Using the formula we get…

Q: A random sample of 100 people from Country S had 15 people with blue eyes. A separate random sample…

A: The provided information are:

Q: A simple random sample of 49 8th graders at a large suburban middle school indicated that 89% of…

A: Given,sample size(n)=49sample proportion(p^)=0.891-p^=1-0.89=0.11α=1-0.95=0.05α2=0.025Z0.025=1.96…

Q: A researcher studying reaction time of drivers states that A 95% confidence interval for the m time…

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Q: a) Construct a 93% confidence interval for the corresponding true proportion. b) With what degree of…

A: p = 0.19 n = 100 Margin of error = 0.02

Q: When calculating a confidence interval on a conditional mean for a specific value of X, and a…

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Q: A sample of 45 households reveals that 23% have traveled overseas. Is this significantly different…

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Q: An epidemiologist with the Florida Department of Health needs to estimate the proportion of…

A: Given,sample proportion(p^)=0.951-p^=1-0.95=0.05margin of…

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

A:

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

A: Given Information:Margin of error, E=0.02Confidence level, c=99%=0.99

Q: The minimum sample size needed to construct a 99% confidence interval for a population proportion…

A: From the provided information, Margin of error (E) = 0.04 Confidence level = 99% Proportion (p) =…

Q: m a random sample of 185 children from school G, 108 indicated they wanted to study science in…

A: The formula of the confidence interval for two proportion is: The formula of the standard error is:…

Q: A national opinion poll found that 44% of all American adults agree that parents should be given…

A: From the provided information, Margin of error (E) = 0.03 Confidence level = 99%

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

A: From the given information,   Margin error = 0.04 Assume Sample proportion = 0.5   Critical value:…

Q: An experiment with 25 randomly selected samples found out that the sample mean temperature for a…

A: Testing of Hypothesis: Testing of hypothesis is a rule which, when the sample values have been…

Q: In the construction of a confidence interval, if all other quantities are unchanged, an increase in…

A: Property of confidence interval:

Q: How large a sample should she take to achieve this? Please carry answers to at least six decimal…

A: Given: sample size, n=332 number of people have flu, x=36 Margin of error, E=0.03 confidence…

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

A: Introduction: The 100 (1 – α) % confidence interval for the population proportion, p is: Here, n is…

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

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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.