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: 5. In a random sample of 400 college students, 16 had perfect attendance Find the 95% confidence…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: You and a friend are interested in knowing if two groups have the same proportion of smokers. The…

A: 1. In the given situation, the proportions of two groups are comparing. The suitable test for…

Q: A 90% confidence interval for the average salary of all CEOs in the electronics industry was…

A: Given Interval $124,443 to $140,235.

Q: 24 A jam manufacturer claims that the mean amount of jam in its 5-ounces jars is 5.1 ounces. A…

A:

Q: 9s

A: Margin of error =E =5%=0.05 90% confidence level

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: rouble locating the Sample proportion and confidence level

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

Q: You're considering going to graduate school, and you would like to know how many people would…

A: From the provided information Sample size (n) = 29, People who recommend x = 9 The sample proportion…

Q: The percentage of high school graduates applying to multiple colleges has been increasing over the…

A: According to the given information,Population proportion, p = 34% = 0.34Sample size, n = 368Number…

Q: For the same sample statistics, which level of confidence would produce the widest confidence…

A:

Q: Out of all the students that attend Yale University, 1,982 were selected to participate in a school…

A:

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: 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: Google is studying the quality of results returned by an upgraded version of its search engine.…

A: From the given information, it can be observed that x = 23 and n =100.

Q: Refer to the following scenario. An epidemiologist is worried about the prevalence of the flu in…

A: The formula of sample size is, Use EXCEL Procedure for finding the critical value of z.   Follow…

Q: A researcher asks 600 people if they received a flu vaccine, and 65% said they did. What is the 95%…

A: From the provided information Sample size (n) = 600 65% said they received a flu vaccine that is…

Q: A national health organization says that 30% of teenagers have tried smoking cigarettes. A health…

A: given data N =3500n = 280x = 56claim : p = 0.30

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: Mr. Price calculates a 95% confidence interval for the difference between the proportion of Aaron…

A: The 95% confidence interval for P Rodgers - P Mahomes is given as (-0.05, 0.15). When the repeated…

Q: Several years ago, 41% of parents who had children in grades K-12 were satisfied with the quality of…

A: Followings are the Explanation of the question Use the One sample Z proportion t test and its…

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

A: In statistical inference, there are two types of estimation,  Point estimation and Interval…

Q: A polling agency interviews 875 American adults and finds that 560 think licensed drivers should be…

A: Givenn=875x=560P⏜ = xn=560875 = 0.64

Q: (a) Find a 95% confidence interval for p1 - P2. (Use 3 decimal places.)

A: (a) A random sample of 336 married couples found that 292 had two or more personality preferences in…

Q: You and a friend are interested in knowing if two groups have the same proportion of smokers. The…

A: Solution : Given : n1 = nn2 =500             x1 = 490             x2 = 400              α = 0.05…

Q: You plan to construct a confidence interval for the population proportion p. In order to do so, you…

A: Correct answer is d. All of the above.

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…

A: It is given that x = 556n = 914Confidence level = 95%

Q: Please see the second part below. I have included the answer from the first one.  NBC News/Marist…

A:

Q: In a sample survey, 138 students failed the exam out of 200 total students.  1. Calculate the 95%…

A:

Q: You want to estimate the proportion of current OSU students who were born outside of Ohio. You…

A: Given: n= 300 At 99.0 % confidence level , z score= 2.576 Need to find MARGIN OF ERROR for…

Q: Refer to the following scenario. An epidemiologist is worried about the prevalence of the flu in…

A: To find the sample size required for estimating the population proportion with a 95% confidence…

Q: In a certain high school, 7 out of 11 juniors said that they planned to go to the winter prom.…

A:

Q: The school's newspaper reported that the proportion of students majoring in business is more than…

A: According to the given information in this question We need to identify the correct option

Q: 1. A university health services physician is concerned about how much sleep freshman are getting.…

A: since parameter is proportion here, we use one same proportion confidence interval.

Q: Some students think that a 90% confidence interval contains 90% of the data. Use the list of data on…

A: As it is calculated that,  90% confidence interval for mean is,  (295753.6,464478.4)

Q: You observe 40 customers at a coffee shop, and 77% of them tip. What is the 95% confidence interval…

A: p=0.77 n=400

Q: a. Which test will you use to test for this statistical analysis? b.State the null and alternative…

A: The proportion of men who used smartphones = 379/973 =0.3895 =p1 The proportion of women who used…

Q: We constructed a 95% confidence interval for a population mean. Which of the following would cause…

A: The objective is to identify which of the given statements would cause the confidence interval to…

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.