A psychiatrist is interested in finding a 95% confidence interval for the tics per hour exhibited by children with Tourette syndrome. The data below show the tics in an observed hour for 13 randomly selected children with Tourette syndrome. Round answers to 3 decimal places where possible.

Q: If n = 340 and p^=0.92, find the margin of error at a 90% confidence level E= Give your answer to…

A: Given,n=340p^=0.921-p^=1-0.92=0.08α=1-0.90=0.1α2=0.05Z0.05=1.645

Q: All else being equal, a 90% confidence interval will be longer than a 95% confidence interval. True…

A:

Q: In a recent poll, 300 people were asked if they liked dogs, and 54% said they did. Find the Margin…

A: Obtain the margin of error for the poll at the 95% confidence level. The margin of error for the…

Q: following is a 95% confidence interval for the proportion of all students at the school who ate…

A:

Q: Out of 100 people sampled, 16 have tried marijuana. Based on this, construct a 95% confidence…

A: Obtain the 95% confidence interval for the true population proportion of people who have tried…

Q: Find the 95% confidence interval for the mean difference of the tests, and explain it.

A: Test - 1 (X) Test-2 (Y) (x-xbar) (x-xbar)^2 (y-ybar) (y-ybar)^2 1.2 1.4 -0.31111 0.09679 -0.24444…

Q: In a recent poll, 200 people were asked if they liked dogs, and 16% said they did. Find the Margin…

A: Solution: From the given information, 0.16 and n=200. The confidence level is 0.90.

Q: (b) Construct a 90% confidence interval for the proportion of all adult Americans who have seen or…

A: Given: n= 4001 ,x= 722.0 At 90.0 % confidence level , z score= 1.645 Need to find confidence…

Q: 3. You want to find out the percent of people who use an iPhone, so you survey 120 random adults, of…

A: Here we need to construct a 95% confidence interval for the population proportion.

Q: find a 99% confidence interval for the proportion of us adults favoring taxes on soda and junk food.…

A:

Q: In a random sample of 500 people eating lunch at a cafeteria on various Fridays, it was found that…

A:

Q: The County Development Agency does a survey of all the mobile home manufacturers in Clarion County…

A: X̄ = $13,550, σ = $2,000, n = 25,

Q: A New York Times article reported that a survey conducted in 2014 included 36,000 ​adults, with…

A: A margin of error could be a statistical measurement that accounts for the difference between actual…

Q: 1. Your colleague collected a sample of data regarding the mean length of a movie and they computed…

A: It has been given that the confidence interval of the mean length of a movie has been computed on a…

Q: We would like to know: "What percentage of college students drink alcohol every day?" In a random…

A: Given that, N=500 X=75

Q: In a recent poll, 240 people were asked if they liked dogs, and 46% said they did. Find the Margin…

A: Given that, Critical values: By using the standard normal table of Z, the critical value at 95%…

Q: We would like to know: "What percentage of college students read the college newspaper every day?"…

A: It is provided that there is random sample of 500 college students in which 231 students said that…

Q: In a random sample of 500 people eating lunch at a cafeteria on various Fridays, it was found that…

A: Given that Sample size n= 500  Favorable cases x=160 Sample proportion p^=x/n

Q: Out of 500 people sampled, 250 had kids.The best point estimate for p is? The margin of error for a…

A: Given Information: Out of 500 people sampled, 250 had kids. n = 500, x = 250 Point estimate for…

Q: In one city, 59.6% of the 1500 students surveyed said they eat at the school cafeteria. Find the 95%…

A: Given, Sample size=n=1500 p^=0.596 α=0.05

Q: A​ 95% confidence interval for the proportion of U.S. adults who subscribe to some sort of streaming…

A: In the above question, we are given,  a confidence interval is

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

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

Q: kendall wants to estimate the percentage of vegetarians who are also vegan. She surveys 150…

A: The margin of error for the 95% confidence interval of population proportion is given as follows :…

Q: The principal of a school claims that 30% of Grade 3 pupils stay in the playground after their…

A: We have given that  Population proportion p=30%=0.30 ,sample size n=500, and alpha =0.05 Sample…

Q: In a recent poll, 260 people were asked if they liked dogs, and 80% said they did. Find the Margin…

A: Given:

Q: The number of television sets coming off a production line each day is known to have a standard…

A:

Q: The value of t for 20 degrees of freedom and a 98% confidence interval is: -2.528 O 1.328 O 2.528 O…

A: The degrees of freedom is df=n-1=20 The confidence interval is 98%. The level of significance is…

Q: . A survey of folk music fans yields this 95% confidence interval estimate of the proportion of fans…

A: The 95% confidence interval for proportion of fans who love music of David Wilcox is 0.74 to 0.86

Q: A social science research project has a level set at .05. What is the probability of the researchers…

A: alpha = 0.05

Q: If n = 13, T=30, and s = 3, construct a confidence interval at a 99% confidence level. Give your…

A:

Q: Suppose that you have obtained data by taking a random sample from a population and that you intend…

A: 95% percent confidence interval will give more accurate estimate of µ than 99% confidence interval.…

Q: A survey of folk music fans yields this 95% confidence interval estimate of the proportion of fans…

A: Solution: From the given information, the 95% confidence interval of the proportion of fans who love…

Q: In the Laboratory Activity, we used 90% confidence interval instead of 100%, why is this so? Why not…

A: Confidence Interval A confidence interval (CI) is a set of numbers that assess the validity of the…

Q: Cora wants to determine a 99 percent confidence interval for the true proportion p of high school…

A: Given data: Margin of error (E) = 0.01 Confidence level  = 99 % To find : The required sample size…

Q: In a survey, the planning value for the population proportion is .25. How large a sample should be…

A: We have to find sample size..

Q: Gallup is a company that conducts daily opinion polls on a variety of topics. In a recent daily…

A: Given that, Sample size, n = 1000 38% of the sample said they were committed to their work.

Q: State the equation for the 95% confidence interval?

A: The equation for confidence interval can be stated as: Here x̅ is the sample mean, Zα/2 is the…

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

A:

Q: Is 12 minutes the margin of error for this 95% confidence interval v [Select ]

A: The 95% confidence interval for the average arrival time before departure for all air travellers is…

Q: 4) Out of the 440 people surveyed, a 110 said they listen to Spotify at least one a month. With the…

A:

Q: In the previous example, you learned that the 95% confidence interval for the true proportion of all…

A: Calculate the point estimate and margin of error used to create this confidence interval.

Q: In a recent poll, 450 people were asked if they liked dogs, and 54% said they did. Find the Margin…

A: Solution

Q: A psychologist is studying the effects of lack of sleep on the performance of various…

A: We have to find ci for given data.

Q: In a recent poll, 600 people were asked if they liked dogs, and 33% said they did. Find the Margin…

A: Margin of error (M.E.): The margin of error for proportion p is given by,

Q: Michelle, a student studying music, randomly sampled fellow music majors and asked whether they…

A: Given information- Confidence interval = (0.09, 0.26) We have to find margin of error. We know that-…

Q: Thirty randomly selected students took the calculus final. If the sample mean was 95 and the…

A: The summary of statistics is, The degree of freedom is, Critical value: By using the t-tables, the…

Q: A nutritionist wants to know the population proportion of Grade 1 learners who eat vegetables.…

A: 2) It is given that the sample size n is 1200 and the number of respondents who eat vegetables (x)…

Q: Researchers studied the mean egg length (in millimeters) for a bird population. After taking a…

A:

Q: Find the value of −zα/2 that corresponds to a confidence level of 89.48​%.

A:

Q: In a recent poll, 430 people were asked if they liked dogs, and 94% said they did. Find the Margin…

A:

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.