12. A poll showed that 48 out of 120 randomly chosen graduates of California medical schools last year intended to specialize in family practice. What is the width of a 90% confidence interval for the proportion that plan to specialize in family practice? A) ±.0447 B) ±.0736 C) ±.0876 D) ±.0894

Q: Suppose that you plan to apply the one-mean z-interval procedure to obtain a 90% confidence interval…

A: a. Margin of error: Margin of error is a range of values that lie above and below the sample…

Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…

A: Given information Error = 4% = 0.04 Confidence level = 0.95

Q: 12)     If n=410 and ˆpp^ (p-hat) =0.23, find the margin of error at a 95% confidence level Give…

A:

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

A:

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: 4) A firm would like to estimate the mean age of all people in the civilian labor force. What size…

A: Hey, since there are multiple questions posted, we will answer first question. If you want any…

Q: By law, all new cars must have airbags on both the driver's side and the passenger's side. There is…

A: Given that  n=55 , X=35

Q: 11). A sample of 400 racing cars showed that 80 of them cost over $700,000. What is the 99%…

A: Given: n= 400  Number of cars in the sample that costs over $700000 = 80  the sample proportion of…

Q: Find a 95% confidence interval for the true population proportion during the questioning of 78…

A: According to the given question, during the questioning of 78 potential jury members 37% said they…

Q: 4) A simple random sample is to be taken of 572 business majors in a college to estimate the…

A: When we don't have any prior information about population proportion, we generally take it as 0.50.…

Q: 3. A survey of 2,950 Filipinos showed that 2,655 trust the Supreme Court decisions on legal issues.…

A: Let X be the number of trust the supreme court decision on legal issues  n be the sample size  Given…

Q: Fewer young people are driving. In year A, 65.9% of people under 20 years old who were eligible had…

A: Solution-: Given: n=1700 In year A, p^=0.659 (or 65.9%)  In year B, p^=0.427 (or 42.7%) Our aim to…

Q: 3. In a survey of 209 Montana residents, 61 reported their financial status was worse than a year…

A: (a) Computing the point estimate of population proportion:The point estimate of population…

Q: 2. A national health organization warns that 30% of the middle school students nationwide have been…

A: Given : n = 110 X = 21

Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…

A: Given information Error = 2% = 0.02 Confidence level = 0.95

Q: What proportion of homes for sale in Ohio are sold through a real estate agency? In a survey of a…

A: The confidence interval is 0.69 to 0.81.

Q: The national Council of Small Businesses wishes to construct a 95% confidence interval for the…

A: In this question, it has been given that margin of error = 0.10,Level of significance = 0.05,We have…

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: how many people should you sample? 4 80 125 382 383

A: Given : Margin of error: ME = 0.05

Q: 2. A study is undertaken to determine the proportion of industry executives who believe that…

A: Let us assume sample proportion(p^)=0.51-p^=1-0.5=0.5α=1-0.99=0.01α2=0.005Z0.005=2.58    (from…

Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…

A:

Q: 16- An economist is interested in studying the incomes of consumers in a particular country. The…

A: We have to find ci.

Q: 11. A university planner wants to determine the proportion of spring semester students who will…

A: According to the given information, we have Total number of students = 32 12 students will return…

Q: 9. The Centers for Disease Control and Prevention reported a survey of randomly selected Americans…

A:

Q: 5) Researchers are designing a study to determine whether the age of the victim is a factor in…

A: Given that :  Researchers are designing a study to determine whether the age of the victim is a…

Q: 1. A poll of 2,500 people shows that 50% approve of a smoking ban in bars and restaurants. What is…

A:

Q: Suppose that we want to conduct a 90% confidence test about whether the most recent marketing budget…

A: Given, Suppose we want to conduct a 90% confidence test about whether the most recent marketing…

Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…

A: According to the provided information, The z score at 95% confidence interval from the standard…

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

A: Please see the attachment..

Q: Suppose that you plan to apply the one-mean z-interval procedure to obtain a 90% confidence interval…

A: It is given that the population standard deviation is 12 and the sample size is 9.

Q: 7) The state education commission wants to estimate the proportion of tenth grade students that have…

A:

Q: 4. The Department of the Treasury is interested in finding out what proportion of people support…

A: Given that  Population proportion p=15%=0.15 Margin of error =E =2%=0.02 95% confidence.  NOTE:-…

Q: 4.An internet service provider wishes to estimate, to within one percentage error, the current…

A: Given : Margin of error (E) = 1% = 0.01 Confidence level = 85% So , significance level (α) = 15% =…

Q: 30. A research and development engineer is preparing a report for the board of directors on the…

A: Answer: Take a new sample from the population using a larger sample size.

Q: 4) A study of 12,000 cell phone users found that 125 of them developed cancer of the brain or…

A:

Q: B) False A senator wishes to estimate the true population proportion p of United States voters who…

A:

Q: 1-a. A random sample of 900 13- to 17-year-olds found that 411 had responded better to a new drug…

A: 1. Given  The sample size n is 900. Here, x is 411 respondents responded better to a new drug theory…

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: 4. The manager of University Credit Union (UCU) would like to know what proportion of her customers…

A: According to the given information, we have Total number of customers = 400 Given that 271 of the…

Q: 1. In a poll of 2,500 likely voters, 966 say that the Philippines spend too little on education.…

A:

Q: 14. Find the sample size that will produce the maximum error of a 99% confidence interval for a…

A:

Q: 5| What is the coverage of the confidence interval [p to 1]?

A: Consider thatp^ and p, are the point estimate and the population proportion, respectively.…

Q: Jump to level 1 1. In a poll of 1000 randomly selected voters in a local election, 414 voters were…

A: We have given that,  Sample size (n) = 1000 and favorable cases (X)= 414 Then,  We will find the…

Q: b. Construct a 90% confidence interval for the percentage of all judges who are in favor of the…

A: a. A random sample of 15 judges and asked them whether or not they favor the death penalty in which…

Q: 11. Refer to the accompanying data set of 20 randomly selected presidents. Treat the data as a…

A: The following information has been given: The number of presidents who are taller than their…

Q: 2. Estimate the proportion of WCU students who have type B blood using 95% confidence interval.…

A: Given , n=100x=24p^=xn=24100=0.241-p^=1-0.24=0.76α=1-0.95=0.05α2=0.025Z0.025=1.96

Q: Construct a 99% confidence interval for the true proportion of all car license applications that…

A: Given Information:x=25n=155c=99%=0.99

Q: 1. Construct a 90% confidence interval for the proportion of employees requiring size 3.

A: here given  A civil engineering firm issues every new employee with a safety helmet. Four different…

Q: 17. Cora wants to determine a 80 percent confidence interval for the true proportion p of high…

A:

Q: 2. A survey found that out of 900 workers, 150 said that they were interrupted by frank phone calls.…

A: In question, We have given the number of favorable cases 150 and sample size 900 then we'll find 95%…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.