Facebook penetration values (the percentage of a country’s
population that are Facebook users) for 15 randomly...
Facebook penetration values (the percentage of a country’s
population that are Facebook users) for 15 randomly selected
countries are: 52.56, 33.09, 5.37, 19.41, 32.52, 41.69, 51.61,
30.12, 39.07, 30.62, 38.16, 49.35, 27.13, 53.45, 40.01.
Give point estimates for the population mean Facebook
penetration (µ), and the population standard deviation of
Facebook penetration (σ).
Construct a 95% confidence interval estimation for µ.
Interpret.
Construct a 95% confidence interval estimation for
σ. Interpret.
What assumptions do you need to make about the population so
that the
confidence intervals given in (b) and
(c) are valid?
Solutions
Expert Solution
d. The assumptions needed to construct this confidence intervals
are
1. The selected samples should be randomly and independently
selected.
2. The samples should be approximately normally distributed.
A study wants to compare the
percentage of Facebook users between males and females in a county.
A sample of 95 males shows that 46 of them use Facebook. A sample
of 90 females shows that 48 of them use Facebook.
(a) What are the populations?
(b) At α = 0.01 level of significance, is there evidence that
the two population proportions are different?
(c) Identify the type of error for your conclusion. If it is
type I error, find...
The file Mobile Commerce contains the following mobile commerce penetration values, the percentage of the country population that bought something online via a mobile phone in the past month, for twenty-eight of the world’s economies:
17 15 15 13 27 12 20 23 9 9 16 6 19 14
11 14 8 15 23 11 37 17 11 19 27 18 18 15
a. Compute the first quartile, the third quartile and interquartile range
b. List the five number summary
The age of Facebook users is normally distributed. The average
age of a user on Facebook is 40.5 with a standard deviation of 10.
1. What is the probability that a single randomly selected person
that is on Facebook is less than 20 years of age? (round to four
decimals) nothing 2. What is the probability that a sample of 15
Facebook useres is between 30 and 40 years of age?
Five brands are competing in the market.Company A has 35,000 units sold at $5.00/unit. It sold to 7,000
households in market size of 84,000.Company B has 12,000 units sold and revenues of $54,000 for
these units. It sold to 3,000 households in market size of
21,000.Company C has 14,000 units sold at $5.50/unit. The average
household purchase was 2 units. Its market size of 105,000.Company D has 5,000 units sold at $6.00/unit. It sold to 833
households in market size...
Write a program to store record of 15 Facebook users using
Dictionary data type. Actual name record should hold username,
number of friends, place, date of birth and the date their account
was created.
https://realpython.com/python-lists-tuples/
https://realpython.com/python-dicts/
Facebook recently examined all active Facebook users and
determined that the average user has 183 Facebook friends. Suppose
that the population of number of Facebook friends of a randomly
selected user has a standard deviation of σ = 241. Facebook draws a
SRS of 250 Facebook users. What is the probability that the average
number of Facebook friends is less than
175? Apply the Central Limit Theorem.
Caution: do not round at your intermediate steps. Hint: you
may need to...
A researcher is conducting a study on numbers of Facebook users.
Suppose Facebook reports that, based on user data from the provided
32 countries, the mean number of Facebook users is about 24,000,000
per country. Use a t-test in Minitab to determine whether or not
the data provided yields a statistically significant result. A. Go
to Stat->Basic Statistics->1-Sample t… and after selecting
the proper variable, perform a hypothesis test with a hypothesized
mean equivalent to what Facebook reports. Make sure...
A researcher is conducting a study on numbers of Facebook users.
Suppose Facebook reports that, based on user data from the provided
32 countries, the mean number of Facebook users is about 24,000,000
per country. Use a t-test in Minitab to determine whether or not
the data provided yields a statistically significant result. A. Go
to Stat->Basic Statistics->1-Sample t… and after selecting
the proper variable, perform a hypothesis test with a hypothesized
mean equivalent to what Facebook reports. Make sure...
Facebook breach resulted in the exposure of 87 million users
and led to election meddling
Facebook storing users’ passwords in unencrypted format
500 million guests’ data was exposed by Marriott hotels
Using the above examples, and others answer the following
questions:
What factors within these organizations led to the
loss/exposure of private information? Think about technical,
people, and process factors
What are the consequences of the breaches on business and
people?
What is the effect of big data and analytics...
The social media industry is highly monopolistic with Facebook,
users provide Facebook (and 3rd-party companies) with huge amounts
of data in exchange for access to the platform. provides Facebook’s
algorithms with a clear picture of your preferences or demand for
certain goods/services. Technological underperformance is a welfare
cost associated with monopolies. For companies such as Facebook,
innovation would be minimal due to lack of competition. a) From
Industry perspective, please give some ideas to argue that the
market doesn't work...