reported in 2014 that the mean number of Facebook friends for 18- to 24-year-olds is 649....
reported in 2014 that the mean number of Facebook friends for 18- to 24-year-olds is 649. Assume the distribution is normal with μ=649 friends and standard deviation σ=150 friends. Find the probability that a randomly selected Facebook user has the following number of friends:
- Fewer than 424 friends.
- More than 949 friends.
- Between 424 and 949 friends.
- Find the number of Facebook friends that represents the 75th percentile.
- One particular Facebook user has 1174 friends. Is this unusual? On what do you base your answer?
- A Facebook newbie has a number of friends equal to the 5th percentile. Find the 5th percentile of Facebook friends.
- An online socialite has the 95th percentile of friends. Compute the 95th percentile.
- Calculate the two symmetric numbers of friends X1 and X2 that contain the central 90% of Z-values between them. Is there a shortcut you can take?
- Calculate the two symmetric numbers of friends X1 and X2 that contain the central 95% of Z-values between them.
- What if we calculate the two symmetric numbers of friends that contain an unknown value greater than 95% between them? Will the values X1 and X2 be closer together or farther apart than the 95% case? Explain.
Homework Answers
Add Answer to:
reported in 2014 that the mean number of Facebook friends for
18- to 24-year-olds is 649....
Suppose that the average number of Facebook friends users have is normally distributed with a mean...
Suppose that the average number of Facebook friends users have is normally distributed with a mean of 146 and a standard deviation of about 55. Assume seven individuals are randomly chosen. Answer the following questions. Rourd all answers to 4 decimal places where possible. a. What is the distribution of 2? 655 b. For the group of 7, find the probability that the average number of friends is more than 158. c. Find the third quartile for the average number...
A recent study has shown that 28% of 18-34 year olds check their Facebook/Instagram feeds before getting out of bed in t...
A recent study has shown that 28% of 18-34 year olds check their Facebook/Instagram feeds before getting out of bed in the morning, If we sampled a group of 150 18-34 year olds, what is the probability that the number of them who checked their social media before getting out of bed is: a.) At least 34? b.) No more than 50? c.) between 40 and 44 (including 40 and 44)? Use the Normal Approximation to the Binomial distribution to...
STA2221 examples on CI & Testing of Hypothesis Name MULTIPLE CHOICE. Choose the one alternative that...
STA2221 examples on CI & Testing of Hypothesis Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answer the question Provide an appropriate response. 1) Find the critical value,te for 0.99 and n-10. A) 3.250 B) 3.169 1.833 D) 2.262 2) Find the critical value to forc=0.95 and n=16. A) 2.947 B) 2.602 2120 D) 2.131 3) Find the value of E, the margin of error, for A) 1.69 B) 0.42 0.99, n=16 and s=2.6. C)...
You need not run Python programs on a computer in solving the following problems. Place your...
You need not run Python programs on a computer in solving the following problems. Place your answers into separate "text" files using the names indicated on each problem. Please create your text files using the same text editor that you use for your .py files. Answer submitted in another file format such as .doc, .pages, .rtf, or.pdf will lose least one point per problem! [1] 3 points Use file math.txt What is the precise output from the following code? bar...
photos for each question are all in a row (1 point) In the following questions, use...
photos for each question are all in a row
(1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
Suppose that the average number of Facebook friends users have is normally distributed with a mean of 146 and a standard deviation of about 55. Assume seven individuals are randomly chosen. Answer the following questions. Rourd all answers to 4 decimal places where possible. a. What is the distribution of 2? 655 b. For the group of 7, find the probability that the average number of friends is more than 158. c. Find the third quartile for the average number...
STA2221 examples on CI & Testing of Hypothesis Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answer the question Provide an appropriate response. 1) Find the critical value,te for 0.99 and n-10. A) 3.250 B) 3.169 1.833 D) 2.262 2) Find the critical value to forc=0.95 and n=16. A) 2.947 B) 2.602 2120 D) 2.131 3) Find the value of E, the margin of error, for A) 1.69 B) 0.42 0.99, n=16 and s=2.6. C)...
You need not run Python programs on a computer in solving the following problems. Place your answers into separate "text" files using the names indicated on each problem. Please create your text files using the same text editor that you use for your .py files. Answer submitted in another file format such as .doc, .pages, .rtf, or.pdf will lose least one point per problem! [1] 3 points Use file math.txt What is the precise output from the following code? bar...
photos for each question are all in a row
(1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
Most questions answered within 3 hours.
-
Which of the following pertains to furanocoumarins
produced by members of the Umbelliferae (like wild parsnip)....
asked 38 seconds ago -
Question 1 (1 point)
Suppose the Federal Aviation Administration (FAA) would like to
compare the on-time...
asked 32 minutes ago -
Balance and classify the following reactions: combination (C),
decomposition (D), single replacement (SR), double replacement (DR)...
asked 8 minutes ago -
A heavy man’s resting weight is 1029 N. He is standing on a
scale on an...
asked 15 minutes ago -
The following reaction describes the oxidation of
pyrite (FeS2) by oxygen in the presence of water:...
asked 23 minutes ago -
Law can create or perpetuate health-harming social conditions.
True /False?
asked 15 minutes ago -
Schedule of Cash Collections of Accounts Receivable Pet Stop
Inc., a pet wholesale supplier, was organized...
asked 22 minutes ago -
Imagine you own a restaurant. Sales are a little slow during the
week, so you decide...
asked 29 minutes ago -
Case 4 Title: Leslie Products Leslie Products LLC was formed by
Marshall classmates Leslie Paulson and...
asked 47 minutes ago -
Consider a drug that is used to help prevent blood clots in
certain patients. In clinical...
asked 1 hour ago -
A calorimeter is a container that is insulated from the outside,
so a negligible amount of...
asked 1 hour ago -
Churchill Bank has reserves of $100mn and loans to clients of
$500mn. In addition, it has...
asked 1 hour ago