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Visual Studio Coding (R)

22/10/2020 Client: bingyanj Deadline: 7 Days

   In this exercise, you will work with rivers data. The data pertain to the length of major North American rivers, and it is built-in data in R. You can access the data by typing: 


> rivers 


Your task is to build a function that returns descriptive statistics for different inputs. The function is named descriptive_function and has three arguments (i.e., another name of inputs). 


descriptive_function(list, char, num) 


The requirements of the function are as follows: 


· The function has three arguments. The first argument is a list of numbers in doubles. The second argument is a character, and the last argument is a number. 


· If char is ‘m ’, the function prints the arithmetic mean of the list. 


· If char is ‘v’, the function prints the variance of the list. 


· If char is ‘s’, the function prints the standard deviation of the list. 


· If char is ‘z’, the function prints the z-score of num with respect to the list. 


· You can use built-in R functions including mean(), var() and sd(). 


Sample test cases: 


> descriptive_function(rivers, 'm', 7) 


[1] 591.1844 


> descriptive_function(rivers, 'm') 


[1] 591.1844 


> descriptive_function(rivers, 's') 


[1] 493.8708 


> descriptive_function(rivers, 'v', 8) 


[1] 243908.4 


> descriptive_function(rivers, 'z', 8) 


[1] -1.180844

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