QUIZ-3

1. ANOVA testing is used to find:*

• Relationship between numerical and categorical variable

• Relationship between 2 categorical variables

• Relationship between 2 numerical variable

• Relationship between 3 numerical varaibles

2. Chi-Square testing is applied to find*

• Relationship between numerical and categorical variable

• Relationship between 2 categorical variables

• Relationship between 2 numerical variable

• Relationship between 3 numerical varaibles

3.  suppose p-value returned by chi-square testing applied on two valuables Exercise and Smoke is 0.4382.  based on this p-vale both variables are:*

• Independent to each other

• Dependent on each other

4. By default level of significance is:*

• 0.02

• 0.05

• 0.01

• 0.1

5. How can we find the geometric mean of vector x?*

• mean(x)

• (prod(x)^(1/length(x))

• (1/mean(1/x))

• median(x)

6. consider a frequency table(y) of vector x, how can you calculate mode*

• names(y)[which(y==max(y))]

• names(y)[which(y==min(y))]

• name(y)[which(y==max(y))]

• names(y)[which(y)]

7. consider frequency table in question 34, what will be the mode of  x<-c(33,33,33,22,12,23,44,44,44,23)*

• [1] “33” “44”

• [1] “1”

• [1] “44”

• [1] “33”

8. to calculate variance of vector x, which of the following functions is used:*

• var(x)

• variance(x)

• sqrt(var(x))

• VAR(x)

9. Interquartile range divides the dataset into _____ quarters*

• four

• three

• two

• five

10. if the significance level is set to 0.1 probability, then the sample mean less than 10% will be  *

• rejected

• accepted

11. function used to perform chi-square testing is:*

• chi.sq()

• chisq.test()

• chisquare()

• chitest()

12. to perform data analysis of twitter, which package is used*

• rtweet

• twitter

• tweet

• none of the above

13. Hypothesis is*

• an assumption

• a statement

• true value

• none of the above

14.  consider two vectors > x<-c(1,2,3,4)> y<-c(5,6,7,8) what will be the output of code z<-cbind(x,y))*

• Option 1

• Option 2

• error will be generated

15.  in order to write the title of a plot generated by ggplot2 package. which of the following functions is used*

• ggtitle()

• ggwrite()

• ggdesc()

• ggtext()

ASSIGNMENT-3