Wednesday, January 28, 2015

25 Billion Apps Blog


1.  What assumptions have you made in your model?
I calculated the seconds rate and determined the rate of 570 apps per second, then I calculated the app per minute and found that the rate was also close to 570, so I assumed the rate was constant all the time.Even though we know it was probably not the same because early on in the beginning of the app store, it was probably slower, and as time goes on more people buy I products and download apps from the app store, and the rate increases. I assumed it was constant all from day one till 25 B.

Below you see my calculations
Seconds RateData Point 1Datax secondsyUnits
1February 24th024,658,498,009
2February 24th924,658,503,135
slope 1y2-y15,126
x2-x19
m=570apps per second
Minutes RateData Point 2Datax minutesy
1February 24th2724,658,507,655
2February 24th4324,659,054,476
slope 2y2-y1546,821
x2-x116
m=34,176apps per minute
570
Hour Rate2,050,579apps per hour
Day Rate49,213,890apps per day


2. 

a. Interpret the parameters in your linear model.  
y=apps downloaded
m=apps/time
x=time in hour
b= at time 0, no apps
y= 2,050,579 * X+ B 
using the hour rate because I do not want to bombard all day long.
final equation: y= 2,050,579 * X


b.What do the units of slope represent?  
As you can see above the slope is the rate apps per time.

c.What does the y-intercept represent?
the number of apps downloaded at time zero.


3. 
a. According to your linear model, when did the app store sell its first app? 
2/24/201224,658,507,6552,050,57912025hours
501.0477257days
1.372733495years
10/10/2010first day app store open501.0477257days earlier

b. Calculate the answer mathematically then find the actual answer. 
When does it hit 25 B
2/24/201224,658,507,655
y=appsm=apps/dayx=day
date unknown25,000,000,000341,492,34549,213,8907
341,492,345left to go
3/1/2012calculated date that it hit the apps store
c. If those answers are different, what could explain the difference?
The reason why they are different is because I stated that my rate was constant, but when the 25 B mark got closer more people decided to buy apps so they can win the grand prize. At the end of the day my prediction was close.




APPLE’S APP STORE HITS 25 BILLION DOWNLOADS, NEXT 25 BILLION UNLIKELY TO TAKE LONG


1 comment:

  1. Could you be more accurate and calculate a time of day to download the app?

    ReplyDelete