MGSC 291 Final EXAM COMPLETE 200 Questions and Detailed Answers LATEST UPDATE THIS YEAR

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MGSC 291 Final EXAM COMPLETE 200
Questions and Detailed Answers LATEST
UPDATE THIS YEAR

QUESTION: Suppose we define a vector to be the numbers 20, 20, 5, and 10 and call it vec4 as

follows: vec4<-c(20,20,5,10)


What does the line of code below return in R?


vec4==10




a. 1


b. 4


c. TRUE


d. FALSE FALSE FALSE TRUE - ANSWER-d. FALSE FALSE FALSE TRUE




QUESTION: Suppose we define a vector to be the numbers 20, 20, 5, and 10 and call it vec4 as

follows: vec4<-c(20,20,5,10)



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What does the line of code below return in R?


sum(vec4==10)




a. 1


b. 4


c. TRUE


d. FALSE FALSE FALSE TRUE - ANSWER-a. 1




This counts the number of entries that are equal to 10.


sum() counts up the TRUEs and FALSEs, treating the TRUEs as 1 and the FALSEs as 0.




QUESTION: A unique number is assigned to each transaction in a database. We would say that

this transaction number is a/an..




a. categorical variable


b. quantitative variable




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c. identifier variable - ANSWER-c. identifier variable




An identifier variable is a special type of categorical variable that is not to be analyzed - it's

simply an identifier.




QUESTION: what does the following line of R code do?


data <- read.csv("myData.csv",strings=T)




a. calls in a dataset and stores it as myData


b. calls in a dataset and stores it as myData.csv


c. calls in a dataset and stores it as data


d. calls in a dataset and stores it as data.csv - ANSWER-c. calls in a dataset and stores it as data




QUESTION: If you get a + instead of the command prompt, <, after hitting Enter/Return in R,

this means...




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a. you are performing addition


b. you need to hit Enter/Return again


c. you didn't close out a parenthesis, quote, etc - ANSWER-c. you didn't close out a parenthesis,

quote, etc




QUESTION: What does the following code do in R?


mean(dName$shipping [dName$weight=="high"])




a. calculates average shipping for heavy items


b. calculates average weight for high shipping - ANSWER-a. calculates average shipping for

heavy items




QUESTION: The summary() function applied to a categorical variable will return...




a. a count of all the unique values


b. the five number summary and mean




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