Lecture_3_intro

In simple linear regression (you can choose more than one answer)

• There is more than one independent variable

• There is only one independent variable

• The dependent variable is numerical continuous

• The dependent variable is numerical continuous or discrete

Which sentence explain the relation between X and y

• There is a linear relation between x and y

• There is no relation between x and y

• There is a non linear relation between x and y

• Negative values of X makes the relation with y not linear

Which statement is true about this linear equation

mpg= W + drat * Z

• The intercept has negative value

• The slope has negative value

• W has negative value

• Z has negative value

ranges=c("2-7", "12-15")

If you want to separate minimum values of each range from the maximum values and keep this values after remove the [ - ] separator

• str_split(ranges,"-")

• str_subset(ranges,"-")

• str_split(ranges," - ")

• str_subset(ranges," - ")

what is the output of the follwoing code

vector=c("Tom", "Jerry", "Mickey)
str_length(vector)

• 3

• [3,5,6]

• [1,2,3]

• 1