cebook apps: The following table presents the number of monthly users for the 15 most popular Facebook applications as of November 2015. Application Monthly Users (millions) Application Monthly Users (millions) Spotify 39.7 SoundCloud 12.7 YouTube 38.8 Facebook for USSD 12.7 Pinterest 35.8 Yelp 11.7 TripAdvisor 33.1 Scribd 10.0 Tinder 26.3 Timehop 8.6 Badoo 20.5 Change.org 8.5 Skype 16.1 Waze 8.2 Give Hearts 14.9 Source: Statista a. Find the mean number of monthly users. b. Find the median number of monthly users. c. Would you expect these data to be skewed to the right, skewed to the left, or approximately symmetric?
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
Facebook apps: The following table presents the number of monthly users for the 15 most popular Facebook applications as of November 2015.
|
Application |
Monthly Users (millions) |
Application |
Monthly Users (millions) |
|---|---|---|---|
|
Spotify |
39.7 |
SoundCloud |
12.7 |
|
YouTube |
38.8 |
Facebook for USSD |
12.7 |
|
|
35.8 |
Yelp |
11.7 |
|
TripAdvisor |
33.1 |
Scribd |
10.0 |
|
Tinder |
26.3 |
Timehop |
8.6 |
|
Badoo |
20.5 |
Change.org |
8.5 |
|
Skype |
16.1 |
Waze |
8.2 |
|
Give Hearts |
14.9 |
|
a. |
Find the mean number of monthly users. |
|
b. |
Find the |
|
c. |
Would you expect these data to be skewed to the right, skewed to the left, or approximately symmetric?
|
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