We wish to estimate the difference in the proportion of college students who use Instagram and the proportion of college graduates who use Instagram in a country with poor mobile internet. You sample 140 college students, and find 80% use Instagram. You sample 200 college graduates and find 15% use Instagram. Find the 95% confidence interval.

Q: An admissions officer is trying to estimate, with 99% confidence, the number of students that should…

A: It is given that, the confidence interval is (2,306, 3,214).

Q: How to identify the length of confidence interval

A: An Interval's Length :  The definition of the length of a confidence interval is normally…

Q: what is measured by a confidence interval and describe the factors that affect the width of a…

A: How much ambiguity there is for any given statistic is a confidence interval. Confidence intervals…

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Q: You measure 41 watermelons' weights, and find they have a mean weight of 47 ounces. Assume the…

A: Given that: n= 41.0 , x̄= 47.0 s= 2.5 At 90.0 % confidence level , z score= 1.645 So, 90.0 %…

Q: The maker of a cell phone screen protector would like to estimate the proportion of customers who…

A: We have given that  Sample size n =200 96% confidence interval.  (0.15 ,0.28)

Q: A television station surveys 200 customers and finds that 23% of customers watch the evening news.…

A: Given data n=200 p=23% confidence level=99%

Q: We wish to estimate what percent of adult residents in Ventura County like chocolate. Out of 500…

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Q: In A Sample Of 5000 Car Owners, 1826 Said That They Would Seriously consider purchasing an…

A: Given that, x = 1826,  n =5000 (a) The point estimate of the population proportion of car owners…

Q: You want to estimate the proportion of all college students who traveled during spring break.   You…

A: Bhnjhhh

Q: 829 adult were surveyed in one city, and 51% of them are opposed to the use of the photo-cop for…

A: Given data: n = 829 p = 0.51

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A: Given data, n=400 x=228 sample of proportion (p)= x/n = 228/400 = 0.57   The z value at 99%…

Q: How do we calculate the confidence intervals

A: Confidence interval is the interval that tells the range where the true value of proportion exist.…

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

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Q: The confidence interval was (22, 26) What was the point estimate? What was the margin of error?

A: Given confidence interval was (22, 26)

Q: I know how to do the first part, I am curious how to get the 95% confidence interval on part 6.

A:

Q: When 290 college students are randomly surveyed, it is found that 120 own a car. Find a 99%…

A: Given that, x=120,n=290 The sample proportion is, Critical values: By using the standard normal…

Q: The mean number of hours watching TV per week for a sample of 153 teenagers is 27. If the margin of…

A: Given,sample size(n)=153sample mean(x¯)=27margin of error(E)=1.2α=1-0.98=0.02α2=0.01Z0.01=2.33…

Q: The tourism organization initially believed that the average Florida rainfall was about 68 inches…

A: Place Rainfall Monticello 56.8 Niceville 71 Tampa 46.3 Lakeland 54.8 St Augustine 49…

Q: Explain the type of Equation used for confidence interval calculation?

A: A confidence interval gives an approximate range of values which is likely to include an unknown…

Q: A survey was conducted to find a 95% confidence interval for the proportion of senior citizens who…

A: From the given information, the 95% confidence interval for the proportion of senior citizens who…

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

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Q: nutritionist

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Q: A survey of 127 patients in a particular hospital determined that 54% of them felt that they were…

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Q: poll surveyed 1024 people about global warming. Of those surveyed, 389 said that they thought global…

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Q: A sample of 1,000 employees in an international company was taken to estimate the average…

A: Confidence interval of mean is given by, (X bar + - Z* sigma/√n) Where X bar is mean and sigma is…

Q: You are going to construct a 99% confidence interval for the proportion of hip replacement…

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Q: In this part of the question, you should calculate the required confidence interval by hand, using…

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Q: 9. How can you make a 95% confidence interval smaller without changing the confidence level?

A: There are several number of ways to reduce the size of confidence interval without making any…

Q: Construct a 95% confidence interval for the proportion of college students who say they own their…

A: Given : n=410 , X=155  , α=0.05 We want to find the 95% confidence interval for the proportion of…

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Q: Describe how a Confidence Interval might be a better piece of information to report from a study…

A: Confidence intervals provide information about a range in which the true value lies with a certain…

Q: An online poll of 810 adults found that 53% of the respondents think critical thinking should be…

A: Given info: An online poll of 810 adults found that 53% of the respondents think critical thinking…

Q: We wish to estimate what percent of adult residents in Pierce County have a high school degree. Out…

A: The sample proportion is, p^=xn=361405=0.8914 Computation of critical value:…

Q: A survey of 240 teachers found that two-thirds of those surveyed do not live in Sydney. Can you…

A: The confidence interval is the combined value of sample statistic, the critical value and the…

Q: The mean amount of money spent on lunch per week for a sample of 54 students is $31. If the margin…

A: Sample mean = x̅ = 31 Margin of Error = 2.30

Q: A random sample of 40 12th-grade students was asked how long it took to get to school. The sample…

A: Given, A random sample of 40 12th-grade students was asked how long it took to get to school. The…

Q: Suppose the English department of a local university has a  total of 105 faculty members. Of this…

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Q: We wish to estimate what percent of adult residents in a certain county are parents. Out of 100…

A: It is given that the sample of 100 adults, 48 had kids. That is, the value of x is 48      and n is…

Q: A survey was taken of randomly selected​ Americans, age 65 and​ older, which found that 416 of 1020…

A: Since you have posted a question with multiple subparts, we will solve the first three complete…

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A:

Q: f a Random Sample of 450 adults includes 155 who identify as happy, compute an 80% confidence…

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Q: Melissa wants to estimate the proportion of adults in the U.S. who own a gun. To do so, she surveys…

A: Given information: Sample size of adults is 45, that is, n = 45. Number of adults who own a gun is…

Q: A survey was taken of randomly selected​ Americans, age 65 and​ older, which found that 413 of 1014…

A: given  x1  = 413 n1  = 1014 x2 =  548 n2 = 1063

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A: Rejection Rule based on Confidence interval:   If the hypothesized value is lies between the…

Q: A surprising fact indicates that a small proportion of teens use a password on their mobile device.…

A: Given data,n=120x=56p=x/n =0.47z-value at 90% confidence interval is Zc=1.645

Q: A survey was conducted to determine the proportion of adults who approve of attempts to clone a…

A: Given,   Lower bound = 0.09 Upper bound = 0.13   The objective is to find the point estimate of the…