MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your R Programming knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In lm(response ~ terms), terms specification of the form “first*second” is same as __________ |
| A. | first+second |
| B. | first:second |
| C. | first+second+first:second |
| D. | first:second+second:first |
| Answer» D. first:second+second:first | |
| 2. |
What plot(s) are used to view the linear regression? |
| A. | Scatterplot |
| B. | Box plot |
| C. | Density plot |
| D. | Scatterplot, Boxplot, Density plot |
| Answer» E. | |
| 3. |
The purpose of correct.cor is to correct _________ in values. |
| A. | difference |
| B. | reliability |
| C. | error |
| D. | similar |
| Answer» C. error | |
| 4. |
Which of the following gives the summary of values likes mean etc? |
| A. | mean |
| B. | sd |
| C. | describe |
| D. | lm |
| Answer» D. lm | |
| 5. |
Which of the following count the number of good cases when doing pairwise analysis? |
| A. | count.pairwise |
| B. | count() + |
| C. | anova.para() |
| D. | count.poly() |
| Answer» B. count() + | |
| 6. |
Which of the following is used to plot multiple histograms? |
| A. | multi.plot() |
| B. | multi.hist |
| C. | xyplot.multi() |
| D. | poly() |
| Answer» C. xyplot.multi() | |
| 7. |
Which of the following convert a matrix of phi coefficients to polychoric correlations? |
| A. | poly() |
| B. | qline() |
| C. | phi2poly |
| D. | multi.plot() |
| Answer» D. multi.plot() | |
| 8. |
WHICH_OF_THE_FOLLOWING_GIVES_THE_SUMMARY_OF_VALUES_LIKES_MEAN_ETC_??$ |
| A. | mean |
| B. | sd |
| C. | describe |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 9. |
The purpose of correct.cor is to correct _________ in values.$ |
| A. | difference |
| B. | reliability |
| C. | error |
| D. | none of the mentioned |
| Answer» C. error | |
| 10. |
Which of the following count the number of good cases when doing pairwise analysis ? |
| A. | count.pairwise |
| B. | count() + |
| C. | anova.para() |
| D. | all of the mentioned |
| Answer» B. count() + | |
| 11. |
Which of the following is used to plot multiple histograms ? |
| A. | multi.plot() |
| B. | multi.hist |
| C. | xyplot.multi() |
| D. | all of the mentioned |
| Answer» C. xyplot.multi() | |
| 12. |
Which of the following convert a matrix of phi coefficients to polychoric correlations ? |
| A. | poly() |
| B. | qline() |
| C. | phi2poly |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 13. |
______ splits a data frame and results an array (hence the da). Hopefully you’re getting the idea here.$ |
| A. | apply |
| B. | daply |
| C. | stats |
| D. | all of the mentioned |
| Answer» C. stats | |
| 14. |
______ let’s you perform SQL queries on your R data frames. |
| A. | sqldf |
| B. | plyr |
| C. | forecast |
| D. | all of the mentioned |
| Answer» C. forecast | |