A large-sample 98% confidence interval for the proportion of hotel reservations that are canceled on the intended arrival day is (0.048, .112). What is the point estimate for the proportion of hotel reservations that are canceled on the intended arrival day from which this interval was constructed?

Q: Identify the t -scores for a 90% confidence interval if the sample size is 25?

A: Givensample size(z)=25α=1-0.90=0.10α2=0.05

Q: Suppose you want to produce an estimate on the percent of students who return to college after their…

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Q: Suppose a different police department says their SRS resulted in a 95% confidence interval of 10.1%…

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Q: What is an approximate 99% confidence interval for the slope of the line of best fit?

A: The provided information is, The 99% Confidence interval can be calculated as,

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: What is the purpose of finding a confidence interval for a proportion?

A: A true (or population) proportion (denoted as p), by definition, is essentially determined as the…

Q: A sociologist wants to construct a 94% confidence interval for the proportion of teenagers who uses…

A: Given, p=0.23 E=0.02 z value at 94% confidence is Zc=1.88 n=?

Q: Out of 400 people sampled, 32 had kids. Based on this, construct a 95% confidence interval for the…

A: Solution: Let X be the number of people had kids and n be the sample number of people. From the…

Q: What is the correct ans.? The change in confidence level (increase, decrease, does not change, none…

A: Solution Confidence level is fixed to find the confidence interval.

Q: A 90% confidence interval for the mean proportion of airline reservations being canceled on the day…

A: Solution: From the given information, a 90% confidence interval for the mean proportion of airline…

Q: Suppose that a 92% Confidence Interval for estimating the average heights, in inches, of all college…

A: confidence interval = x ± margin of errorlower limit = x - margin of errorupper limit = x + margin…

Q: In a survey of 1005 adults 526 stated construct a 95% confidence interval

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Q: According to the study, the average number of hours that the student spent studying per week in the…

A: From the provided information, Mean (µ) = 56 hours Standard deviation (σ) = 14 hours X~N (56, 14)

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: It is required to construct a (1−?)100% confidence interval for the true population median, M using…

A: A sign test is non-parametric. In case of a sign test, we compare the medians, M, instead of the…

Q: A hospital director is told that 32%of the emergency room visitors are uninsured. The director wants…

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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: In a survey of 1037 US adults ages 65 and over, 643 were concerned about getting the flu. A 99%…

A: Given,n=1037x=643p^=xnp^=6431037=0.6201-p^=1-0.620=0.380α=1-0.99=0.01α2=0.005Z0.005=2.58    (from…

Q: We wish to estimate what percent of adult residents in a certain county are parents. Out of 500…

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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: In 2010, the proportion of Texans without health insurance was 0.11. To update this information a…

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Q: Blood pressure is distribued Normally, with a mean of 85 mm and a standard deviation of 20 mm. As a…

A: Given,mean(μ)=85standard deviation(σ)=20sample size(n)=100

Q: In a survey of 3235 adults 1499 say they have started paying bills online in the last year. A 99%…

A: Solution: Let X be the number of adults say they have started paying bills online in the last year…

Q: In a survery of 1118 American adults, 626 said they drink  coffee over tea. What would be the 95%…

A: It is given that, the number of American adults said that they drink coffee over tea is 626 out of…

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…

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Q: Identify the y-score for a 99% confidence interval if the sample size is 35.

A: We have to find critical value for given data..

Q: In the estimation of the population mean, what if given that last year mean is 7.05 and SD is…

A: Confidence Interval provides a range of values for the estimated parameter.

Q: A sample of 421 adults showed that 239 of them are connected to the Internet from home.  Construct…

A: From the provided information, Sample size (n) = 421 From which 239 are connected to the Internet…

Q: What are two ways to get a narrower confidence interval for a proportion?

A: Two ways to get a narrower confidence interval for a proportion are:

Q: In a randomly selected group of 650 automobile deaths, 180 were alcohol-related. Construct a 95%…

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Q: As health insurance costs and the number of disabled employees increase, more companies are firing…

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: How large a sample is needed to estimate the true proportion of these children getting adequate…

A: It is given that Proportion p = 0.45 Margin of error E = 0.025 Level of confidence = 0.99 The…

Q: 90% confidence interval for the mean of airline reservations being canceled on the day of the flight…

A: Given 90% confidence interval is (2.68,9.42)   Lower limit=2.68 Upper limit=9.42 Point estimate p=?

Q: Suppose we know that a confidence interval for a population proportion is (0.572, 0.662), with a…

A:

Q: What is the difference between the different confidence interval formulas?

A: Confidence interval is the estimate of the interval of an unknown population parameter. It provides…

Q: If there was a 95% confidence interval of say, (0.48, 0.68), about a product being preferred by…

A: The confidence interval at 100 (1 – α) % confidence level gives us an interval estimate about the…

Q: The mean was found to be 25% and the confidence interval was (20.4%,29.6%) therefore the margin of…

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Q: Out of a survey of 900 adults, 567 said that teenagers were more dangerous drivers than senior…

A: Givensample size(n)=900No.of adults said that teenagers were more dangerous divers(x)=567sample…

Q: In a survey of 2291 ​adults, 708 say they believe in UFOs.   Construct a 90% confidence interval for…

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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…

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.