Data Science Using R ‘Value Added’ (Quiz 3)

1. ANOVA testing is used to find:*

1. Relationship between numerical and categorical variable
2. Relationship between 2 categorical variables
3. Relationship between 2 numerical variable
4. Relationship between 3 numerical varaibles

2. Chi-Square testing is applied to find*

1. Relationship between numerical and categorical variable
2. Relationship between 2 categorical variables
3. Relationship between 2 numerical variable
4. 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:*

1. Independent to each other
2. Dependent on each other

4. By default level of significance is:*

1. 0.02
2. 0.05
3. 0.01
4. 0.1

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

1. mean(x)
2. (prod(x)^(1/length(x))
3. (1/mean(1/x))
4. median(x)

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

1. names(y)[which(y==max(y))]
2. names(y)[which(y==min(y))]
3. name(y)[which(y==max(y))]
4. 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. [1] “33” “44”
2. [1] “1”
3. [1] “44”
4. [1] “33”

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

1. var(x)
2. variance(x)
3. sqrt(var(x))
4. VAR(x)

9. Interquartile range divides the dataset into _____ quarters*

1. four
2. three
3. two
4. five

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

1. rejected
2. accepted

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

1. chi.sq()
2. chisq.test()
3. chisquare()
4. chitest()

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

1. rtweet
2. twitter
3. tweet
4. none of the above

13. Hypothesis is*

1. an assumption
2. a statement
3. true value
4. 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))*

1. 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*

1. ggtitle()
2. ggwrite()
3. ggdesc()
4. ggtext()