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
  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))*

2
  1. Option 1
3
  • 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()

* The material and content uploaded on this website are for general information and reference purposes only. Please do it by your own first. COPYING MATERIALS IS STRICTLY PROHIBITED.

More from PROGIEZ