We are curious about the average number of Facebook friends that college students have. We take a simple random sample of 40 students and record the number of Facebook friends each student has. 1. Is the 99% Confidence Interval narrower or wider than the 95% (300.26, 416.54)? Why?  2. Your friend claims that he heard that the average number of Facebook friends was 300 in 2010. You suspect that the average has increased. Write down the null and alternative hypotheses you would need to perform a hypothesis test.

Q: A 93.32% Cl is given as (2.5, 3.5). From this information, find a 95% confidence interval (yes, this…

A: The provided information is as follows:The 93.32% confidence interval is (2.5,3.5).

Q: Suppose​ that​ 18% of a random sample of 2307 Miami residents said that they will donate blood in…

A: we have given that sample size =n=2307 ,sample proportion =p^=18%=0.18

Q: You sample 100 people to see if they have been to the grocery store in the past week, and find that…

A: Obtain the 95% confidence interval for the true population proportion. The 95% confidence interval…

Q: Students at a certain college were asked if they have a car. After surveying 823 students, it was…

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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: 2. A principal reported that the same percent of juniors and seniors felt that the homecoming should…

A: Given Data: p^1=6685p^2=4057   Calculating the pooled standard deviation…

Q: Believe it or not, there are some people who dont think that Duke will win the NCAA tournament this…

A: Obtain the 90% Confidence Interval for the IQ of DDs.   The 90% Confidence Interval for the IQ of…

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 you decide that you want to construct a 93% confidence interval. Which one of the following…

A: Given : confidence level, c = 93 %

Q: You have recently had a debate with a friend about who uses smartphones the most. Your friend…

A:

Q: Q4. You conduct a poll comparing two candidates. In a poll of 400 people, 190 prefer candidate A,…

A: Here, let πA and πB be the true population proportion of the supported people for A and B candidate…

Q: You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You…

A: Sample Size: The formula for the sample size is as follows: Here, zα/2 is the critical value at 97%…

Q: rouble locating the Sample proportion and confidence level

A: It is given that n = 2,321 and x = 719.

Q: You plan to construct a 90% confidence interval for the proportion of all middle school students who…

A:

Q: Beth wants to determine a 90% confidence interval for the proportion of high school students in a…

A: We have given that,  Population proportion (p) = 0.57, margin of error (E) = 0.04 and confidence…

Q: A survey of 26 individuals found that they spent an average of $39.21 on exercise attire for the…

A: Confidence interval is an inference process which is used to estimate the population parameter. The…

Q: A researcher wanted to check whether the percentage of Canadian adults with obesity has decreased in…

A: Number of Canadian adults in 2005= 75 Number of Canadian adults in 2009 = 120   significance level =…

Q: Say you've conducted a survey to determine how many people are left handed. You survey 100 people…

A: Here want to construct confidence interval for people who are left handed.

Q: 13. This summer, when I was doing gardening, I got some seeds. The packet with seeds said that 95%…

A:

Q: You sample 33 people to see if they own a dog, and find that 42% of them (rounded) do own a dog.…

A: The random variable X follows binomial distribution. X ~ B (n, p) = > X ~ B (33, 0.42). We have…

Q: Hearts College found that 50 students out of a sample of 600 students take the subway to school.…

A: Given data is fit for difference of proportions. we need to find the confidence interval for 90%.

Q: You are interested in constructing a 95% confidence interval for the proportion of all caterpillars…

A:

Q: You plan to conduct a survey to find what the proportion of the workforce has two or more jobs. You…

A:

Q: The admissions director for a university found that (107.8, 116.2) is a 95% confidence interval for…

A: The admission director for a university found that (107.8, 116.2) is a 95% confidence interval for…

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: Last year your professor taught economics courses to N = 200 students. From this group you randomly…

A:

Q: You are constructing a 99% confidence interval for the proportion of all caterpillars that…

A: Given information- Sample size, n = 396 We have given that out of 396 randomly selected caterpillars…

Q: Thelma and Louise are each attempting to estimate the proportion of adults who enjoy listening to…

A: Given that.  p=0.29 C.I for Thelma's=(0.242 , 0.338) C.I for Louise's=(0.237 , 0.323)

Q: Which of the following confidence intervals would have a wider width for the same set of data? A 90%…

A: We have to find which of the following confidence intervals would have a wider width for the same…

Q: Suppose Bob makes a 95% confidence interval and his result is (70, 90). True or false: We can tell…

A: Given Information: 95% confidence interval = (70,90)

Q: You would like to construct a 99% confidence interval to estimate the population mean score on a…

A: Solution: Let X be the score. From the given information, x-bar=485 and S=70. Here, it needed to…

Q: Construct the 90% confidence interval for the difference p1-p2 when x1=45, n1=85, x2=20, and n2=65.…

A: Given Information: x1=45n1=85x2=20n2=65c=90%=0.90

Q: A researcher wants to estimate the actual proportion of citizens of a certain country who feel that…

A:

Q: We survey a random sample of American River College students and ask if they drink coffee on a…

A: Given information: The 90% confidence interval for the proportion of all American River College…

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

A:

Q: Deborah wants to estimate the percentage of people who eat fast food at least once per week. She…

A: Margin of error is usually computed using the formula below.  In this question, Margin of error is…

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.