According to a 2010 study conducted by the Toronto-based social media analytics firm Sysomos, 71% of all tweets get no reaction. That is, these are tweets that are not replied to or retweeted. Suppose we randomly select 200 tweets.
(a)
What is the expected number of these tweets with no reaction?
(b)
What are the variance and standard deviation for the number of these tweets with no reaction? (Round your answer for the standard deviation to four decimal places.)
variance:
standard deviation:
In: Statistics and Probability
|
World Population Growth Rate |
World Fertility Rate Children per Woman |
||||||
|
1995 |
1.55 |
4.9 |
1965 |
||||
|
2005 |
1.25 |
4.8 |
1970 |
||||
|
2015 |
1.18 |
4.3 |
1975 |
||||
|
2017 |
1.1 |
3.8 |
1980 |
||||
|
3.6 |
1985 |
||||||
|
3.4 |
1990 |
||||||
|
3.1 |
1995 |
||||||
|
2.8 |
2000 |
||||||
|
2.7 |
2005 |
||||||
|
2.6 |
2010 |
||||||
When will the world reach the 2.2 children per woman zero population growth rate?
In: Statistics and Probability
Yahoo! reported the following in its 2011 financial statements (in thousands): (in millions) December 31, 2010 December 31, 2011 Total assets $14,928,104 $14,782,786 Revenues $6,324,651 $4,984,199 Product development expense $1,082,176 $1,005,090 Net income $1,244,628 $1,062,669 What is Yahoo's common-sized product development expense for 2011? A. 6.8% B. 20.2% C. 94.6% D. 93.7% E. None of the above
In: Finance
The table below shows the life expectancy for an individual born in the United States in certain years.
| Year of Birth | Life Expectancy |
|---|---|
| 1930 | 59.7 |
| 1940 | 62.9 |
| 1950 | 70.2 |
| 1965 | 69.7 |
| 1973 | 71.4 |
| 1982 | 74.5 |
| 1987 | 75 |
| 1992 | 75.7 |
| 2010 | 78.7 |
Find the estimated life expectancy for an individual born in 1965 and for one born in 1992. (Round your answers to one decimal place.)
In: Statistics and Probability
Canliss Milling Company purchased machinery on January 2, 2009, for $800,000. A five-year life was estimated and no residual value was anticipated. Canliss decided to use the straight-line depreciation method and recorded $160,000 in depreciation in 2009 and 2010. Early in 2011, the company revised the total estimated life of the machinery to eight years.
Required:
1. What type of accounting change is this?
2. Determine depreciation for 2011.
In: Accounting
In: Statistics and Probability
WHAT IS "BABY BOOMER ECONOMICS"? WHEN WERE THE BABY BOOMERS BORN? RESEARCH : WHAT HAPPENED WITH BABY BOOMER MARKETS GLOBALLY IN THE 1940'S; 1950'S; 1960'S; 1970'S; 1980'S, 1990'S; 2000'S; 2010'S AND TODAY? HOW DOES IT IMPACT THE GLOBAL TRAVEL AND TOURISM INDUSTRY? HOW WILL IT AFFECT YOUR OWN CAREER OR BUSINESS THE NEXT 20 YEARS?
In: Economics
Data from 2010 & 2011, in millions (source: Billboard Magazine):
Company Annual Revenue Market Valuation
Spotify 145 3,000
Warner Music 2,888 3,300
Live Nation 5,600 1,700
Pandora 241 1,300
EMI 1,800 1,900
3a) Find the correlation between annual revenue and market valuation. Is it statistically significant?
3b) Why is the correlation between revenue and market valuation so low?.
In: Statistics and Probability
It is not uncommon to hear that a company’s IT security is compromised. Find nine cases from 2010 to 2018 (i.e. one case for each year). Summarize and compare those nine cases. You need to draw tables to compare them.What are the major implications of your analyses to the IT audit profession? What lessons do they give to the IT audit profession? What is the best way to prevent and detect such cases based on your analyses?
In: Accounting
Business
The annual average natural gas price (in dollars per million
BTUs) can be approximated by the function
h(x) =
69.54e?0.264x
where x = 8 corresponds to the year 2008.
(Data from: Energy Information Administration.)
(a) What was the average price per million BTUs in the year 2010?
(b) According to the model, in what year did the average price per million BTUs hit $3.00?
In: Math