Construct a 99% confidence interval for the difference in proportions of all students and all graduates who took a given pre-requisite course and found it helpful.

Q: In a survey of 1007 parents of children ages 8-14, 75% say they are willing to get a second or part…

A: The survey of 1007 parents of children 75% say they are willing to get a second or part time job…

Q: A poll of 827 students at Alpha State College found that 61% of those polled preferred a quarter…

A: Given that Sample size n = 827 Sample proportion of students who prefer a quarter system = 0.61 The…

Q: A large private university and a large public university selected random sample of incoming freshman…

A: Given:  p1 is the proportion of all entering freshmen at the private university who graduated in the…

Q: Is there a difference in the proportion of construction workers who are under 35 years of age and…

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Q: A sample of 100 homes in city A and 100 homes in City B was taken to estimate the proportion of the…

A: Given that, A sample of 100 homes in city A and 100 homes in city B were taken to estimate the…

Q: A simple random sample of 300 branches out of a total of 1200 branches of a UK travel agency found…

A: Given : Here population is total branches of a UK travel agency  Population Size (N) = 1200 Sample…

Q: Is there a difference in the proportion of construction workers who are under 35 years of age and…

A: Solution-: Given: n1=339,n2=297,x1=285,x2=197,α=0.10 We find 90% C,I, to estimate the difference in…

Q: uman resources managers, 71% of respondents felt they should hire new staff within the next three…

A: The Upper limit can be calculated as: Upper limit = Point estimate (sample proportion) + Margin of…

Q: A university dean is interested in determining the proportion of students who receive some financial…

A: The point estimate=p^=118200=0.59n=sample size= 200z=critical value of 95% confidence…

Q: In a random sample of 500 people aged 20-24, 22% were smokers. In a random sample of 450 people aged…

A: We have to find confidence interval...

Q: In a recent survey of 200 households, 172 had central air conditioning.  Find the 85% confidence…

A: Given that In a recent survey of 200 households, 172 had central air conditioning That is…

Q: Of 127 randomly selected adults, 31 were found to have high blood pressure. Construct a 95%…

A: Given that, Of 127 randomly selected adults, 31 were found to have high blood pressure.  X = 31 N =…

Q: A poll of 827 students at Alpha state college found that 61% of those polled preferred a quarter…

A: It is given that the proportion of the students who preferred a quarter system to a trimester…

Q: The manager of a well-known bank is interested to know whether online banking is more popular…

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

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Q: Of 400 randomly selected medical students, 21 said that they planned to work in a  rural community.…

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Q: in a survey of 499 randomly selected gun owners, it was found that 62 of them said they owned a gun…

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Q: Of 91 adults selected randomly from one town, 60 have health insurance. Find a 90% confidence…

A: From the provided information, Sample size (n) = 91 Out of which 60 have health insurance. Sample…

Q: In a survey of 1200 adults, 562 said that they plan to watch the next Olympics on television. Using…

A: Givenx=562n=1200p^=xn=5621200=0.4683confidence interval = 95%

Q: Based on the results of a survey conducted by a group of researchers, the proportion of female…

A: Confidence interval is a process of inference which uses the sample statistics to find the range of…

Q: A local health centre noted that in a sample of 400 patients, 80 were referred to them by the local…

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

Q: A sample of 250 items from lot A contains 10 defective items, and a sample of 300 items from lot B…

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Q: A survey found that 39 of 66 people who don't drink coffee often have trouble sleeping and 44 of 88…

A: Solution: Let X1 be the number of noncoffee drinkers who have trouble sleeping, n1 be the sample…

Q: In simple random sample of 150 of workers, 22 said their workplace environment is toxic. Construct a…

A: We have to find out given confidence interval..

Q: In a random sample of 500 people aged 20-24, 20% were smokers. In a random sample of 450 people aged…

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Q: 7 out of 70 students said they were comfortable with “working in a workplace with a lot of…

A: Given that  57 out of 70 students said they were comfortable with “working in a workplace with a lot…

Q: Of 2019 employees selected randomly at a company, 10% of them commute by carpooling. Construct a 90%…

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Q: In a random sample of 145 students, we find that 53% have attended a baseball game at some point in…

A: Given,sample size (n)=145sample proportion(p^)=0.53α=1-0.95=0.05α2 =0.025z0.025 =1.96

Q: In a survey conducted by a reputable marketing agency, 231 of 1000 adults 19 years of age or older…

A: Given Data Sample Size, n = 1000 Number of successes, x = 231.0 Significance…

Q: When 328 college students are randomly selected and surveyed, it is found that 122 own a car. Find…

A: We want to find 95% CI for population proportion (p)

Q: A university dean is interested in determining the proportion of students who receive some sort of…

A: Given that, X = 118 N = 200 99% confidence level

Q: In a survey 800 randomly selected 16 to 18 years old living in USA were asked whether they have ever…

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Q: An internet service provider sampled 540 customers and found that 55 of them experienced an…

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Q: In a random sample of 100 drivers, 80 were using seat belts while driving. Construct a 95%…

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Q: A poll is taken among residents of a city and its suburbs to determine the feasibilities of a…

A: The associate with interval estimate is called a confidence interval. This probability indicates how…

Q: Compute a 95% confidence interval for the difference between the proportion of students favoring…

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Q: In a sample of 95 recommendations, it is found that 56% of them made money. Determine the upper…

A: Proportion is almost similar to the concept of probability. Proportion is a fraction of population…

Q: Find the 98% confidence interval for the true difference in population proportions, pˆ A − pˆ B.

A: Given that For drug A, sample size n1 = 50, number of animals showed undesirable side effects, X1 =…

Q: In a certain state, a survey of 500 workers showed that 38% belonged to a union.  Find the 93%…

A: Computation of critical value: 1-α=0.93α=0.07α2=0.0351-α2=0.965 The critical value of z-distribution…

Q: Car and Driver Magazine tested a random sample of 9 hybrid cars and found their MPG to be 42, 51,…

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Q: of 101 randomly selected mothers, 17% indicated that they pay for private preschool, what is the 99%…

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Q: In a survey of 952 respondents, 620 of them voted in a recent election. Find a 95% confidence…

A: From the provided information, Number of respondents (n) = 952 Number of respondents who voted in a…

Q: In a random sample of 500 U.S. adults, 60% said that they believe that the U.S. Congress fails to…

A: Critical value: Using Excel formula “=NORM.S.INV(1-(0.05/2))”, the value of z at 95% confidence…

Q: When 258 college students are randomly selected and surveyed, it is found that 106 own a car. Find a…

A: The provided information is: It is given that 106 college students (s) own a car among 258 college…

Q: An insurance company checks police records on 570 accidents selected at random and notes that…

A: The 95% confidence interval for the percentage of all auto accidents that involve teenage drivers is…

Q: An insurance company collects data on seat-belt use among drivers in a country. Of 1500 drivers…

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Q: Of 375 randomly selected students, 30 said that they planned to work in a rural community. Find 95%…

A: Using z ditribution to construct the interval.

Q: A local health centre noted that in a sample of 400 patients, 80 were referred to them by the local…

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