When the 2000 GSS asked whether human beings developed from earlier species of animals., 53.8% of 1095 respondents answered that this was probably or definitely not true  Question: Find the standard error and 99% confidence interval for the corresponding population proportion. and how would you interpret the 99% confidence

Q: Suppose the NCES would like to re-do their study. If they want a 95% confidence interval with a…

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Q: A random sample of 25 statistics students was asked: "Have you smoked a cigarette in the past week?"…

A: From the provided information, Sample size (n) = 25 Six students reported smoking within the past…

Q: Construct a 95% confidence interval for the proportion of people who performed any volunteer work…

A: It is given as Favourable cases, x = 517Sample size,, x = 517Confidence level = 95%

Q: what would be the 90% confidence interval of the true proportion of young adults who have received…

A: Given that sample size is n = 190 And the sample proportion is 70% = 0.7 At 90% confidence level,…

Q: A national air traffic control system handled an average of 47,189 flights during 29 randomly…

A: The sample size is 29The sample mean is 47189The sample standard deviation is 6351We have to…

Q: If you need to make a 98% confidence interval for a proportion, and the margin of error is to be no…

A: Given information:  Confidence level = 98% Margin of error (e) = 0.025 Let proportion (p) = 0.5 The…

Q: The General Social Survey asked 1294 people whether they performed any volunteer work during the…

A: Sample size, n = 1294Number of successes, x = 517Confidence level = 95%

Q: Suppose we wanted to estimate the average amount of sleep (in hours) a college student gets a night.…

A: Confidence interval : Confidence interval is a range of values it contains the true population…

Q: Suppose that a random sample of 142 graduate-admissions personnel was asked what role scores on…

A: Given : Random sample of 142 graduate-admissions personnel Sample size (n)=142 Let X : No. of…

Q: what sample size should be used to obtain a 99% confidence interval for the mean with +/-15 if the…

A: The margin of error is 15, the standard deviation is 48 and the confidence level is 99%.

Q: Suppose that the a college wants to have an idea of the average SAT score of the incoming freshman…

A: The confidence level is 0.90, the standard deviation is 310 and margin of error E is 50.

Q: suppose an individual was studying temperature's effect on crime rate. The researcher looked at 6…

A: Solution:The sample mean is obtained below:From the given information, number of observations is 6…

Q: A surprising number of young adults (ages 19 to 25) still live in their parents’ homes. A random…

A: Given  X1=986, n1=2253, X2=923, n2=2629

Q: If n= 208 and hatp = 0.46, construct a 95% confidence interval Round your answer to the three…

A: Answer: From the given data, Sample size (n) = 208 p^ = 0.46 95% confidence interval, significance…

Q: Out of sample of 500 people, 25% exercise daily. What is the confidence interval for the population…

A: Given Information:    n=500  p=0.25 q=1-p=1-0.25=0.75α=0.05

Q: A researcher was interested in knowing how many people in the city supported a new tax. She sampled…

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Q: A survey of 45,535 adults showed that 20,901 were very concerned abut climate change. What is the…

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Q: If n=41n=41, ¯xx¯=36, and s=9s=9, find the margin of error for a 80% confidence level.

A: Answer - Given, Sample size n = 41,    x  = 36    and s = 9               80% confidence interval…

Q: A sample of 23 plants was taken and the mean height was 27 cm. A 95% confidence interval for the…

A: From the given information, The 95% confidence interval for the true mean height of plants of that…

Q: Among the 34,506 people who​ responded, 63​% answered​ "yes."   Use the sample data to construct a…

A: Given data: Total number of people who responded for the question presented by online site, n =…

Q: In a survey, 1000 adults in a certain country were asked how many hours they worked in the previous…

A: Confidence interval used to obtain the range where the population true mean lies. It explain the…

Q: 90% confidence interval is narrower than a 95% confidence interval using the exact same data.…

A: Conditions on confidence interval:   As the confidence level increases, width of the confidence…

Q: A 95% confidence interval is narrower than a 90% confidence interval using the exact same data. O…

A: Confidence interval increases with the increase in confidence level 95% confidence interval is wider…

Q: If n=540 and (p-hat) = 0.13, construct a 99% confidence interval. Give your answers to three…

A: We have given that,  Sample size (n) = 540  Sample proportion (p-hat) = 0.13 Then,  We will find the…

Q: General Social

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Q: qualities as options, one of which is "communicator", as the most important quality for an effective…

A: It is given that  Favourable cases, X = 121 Sample size, n = 275 Sample proportion, p^ = X/n…

Q: A survey of 45,535 adults showed that 20,901 were very concerned abut climate change. What is the…

A: It is given asFavourable cases, x = 20901Sample size, n = 45535Confidence level = 99%

Q: We are interested in comparing the percentage of females versus males who expect their future to be…

A: Summarising the given information below. The number of total surveyed females and males:…

Q: 1. A professor is interested in how long the average biostat student studies per night, so he asked…

A: Given data:  n = 10 Data: 3, 4.5, 6, 5.5, 5, 4, 3, 2.5, 5, 3 hours.  Confidence level = 90%…

Q: From a random sample of 120 students, 95 rated a case of plagiarism as unethical. Using this…

A:

Q: Construct a 9595​% confidence interval of the population proportion using the given information. x…

A: Given,x=175n=250α=1-0.95=0.05α2 =0.025Z0.025 =1.96Sample proportion(p^)=Xn p^ =175250 =0.71-p^…

Q: A survey of 20 people asked, “If you’ve ever been married, how old were you when you were first…

A:

Q: If a sample has has a 94% confidence interval of (4.68,5.43), what is the 2-decimal margin of error?

A: Given information- We have given the confidence interval is- C.I = (4.68, 5.43) Lower limit = 4.68…

Q: From a random sample of 120 students, 95 rated a case of plagiarism as unethical. Using this…

A: Compare the length from the formula to the length of given confidence interval.

Q: of 100 people sampled, 50 had kids. The best point estimate for p is. The margin of error for a 90%…

A:

Q: survey conducted by Gallup in 2020 asked 1,102 randomly selected U.S. adults, "What do you think is…

A: We have given that  Sample size n=1102 90% confidence interval.  = (0.6773, 0.7227)

Q: From a random sample of 120 students, 95 rated a case of plagiarism as unethical. Using this…

A: Comparing the length of interval.

Q: If n= 220, p-hat= .4, then what will be the 87.4% confidence interval for the population proportion?

A:

Q: Suppose we take a survey of 400 students and ask how much they study per week. The result is an…

A: The 100 (1 – α)% confidence interval provides an interval estimation of the required population…

Q: From a random sample of 120 students, 95 rated a case of plagiarism as unethical. Using this…

A:

Q: In a survey of 74 US females, 56 said they had gone to the dentist within the past year. What is…

A: Given X=56 n=74

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: A Gallup poll of 1487 adults showed that 43% of the respondents have Facebook pages.  Construct a…

A: Confidence Interval: In statistics, we can say a range of values of the specified population…

Q: From a random sample of 120 students, 95 rated a case of plagiarism as unethical. Using this…

A: Confidence length = upper limit - lower limit

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.