{"id":10101,"date":"2023-05-01T06:57:55","date_gmt":"2023-05-01T06:57:55","guid":{"rendered":"https:\/\/www.scmgalaxy.com\/tutorials\/?p=10101"},"modified":"2023-06-19T13:30:00","modified_gmt":"2023-06-19T13:30:00","slug":"top-50-r-language-interview-questions-with-answers","status":"publish","type":"post","link":"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-r-language-interview-questions-with-answers\/","title":{"rendered":"Top 50 R Language Interview Questions with Answers"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-2.png\" alt=\"\" class=\"wp-image-10102\" width=\"734\" height=\"367\" srcset=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-2.png 960w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-2-300x150.png 300w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-2-768x384.png 768w\" sizes=\"auto, (max-width: 734px) 100vw, 734px\" \/><figcaption class=\"wp-element-caption\"><strong><em>R Language Interview Questions with Answers<\/em><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">1. What is R used for?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) Web development<br>b) Data analysis<br>c) Mobile app development<br>d) Game development<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) Data analysis<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">2. What is the extension of R files?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) .r<br>b) .py<br>c) .js<br>d) .html<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) .r<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">3. Which function is used to load a CSV file in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) csv()<br>b) load()<br>c) read.csv()<br>d) read()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) read.csv()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">4. What does a data frame in R represent?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) A table of data<br>b) A vector<br>c) A matrix<br>d) A list<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) A table of data<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">5. Which function is used to calculate the mean in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) median()<br>b) mean()<br>c) min()<br>d) max()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) mean()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">6. What is the purpose of the ggplot2 package in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) To import data<br>b) To analyze data<br>c) To visualize data<br>d) To clean data<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) To visualize data<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">7. Which of the following is not a data type in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) Numeric<br>b) Character<br>c) Boolean<br>d) Integer<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) Boolean<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">8. Which function is used to create a new variable in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) create()<br>b) add()<br>c) new()<br>d) mutate()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) mutate()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">9. What is the purpose of the dplyr package in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) To manipulate data frames<br>b) To visualize data<br>c) To import data<br>d) To clean data<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) To manipulate data frames<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">10. Which function is used to rename columns in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) names()<br>b) rename()<br>c) label()<br>d) title()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) rename()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">11. Which function is used to convert a character string to a date object in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) to.date()<br>b) as.date()<br>c) strptime()<br>d) date()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) strptime()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">12. Which function is used to subset data in R based on a condition?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) subset()<br>b) filter()<br>c) select()<br>d) arrange()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) filter()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">13. Which function is used to sort data in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) arrange()<br>b) order()<br>c) sort()<br>d) rank()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) arrange()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">14. Which package is used for linear regression in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ggplot2<br>b) dplyr<br>c) tidyr<br>d) stats<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) stats<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">15. Which function is used to calculate the correlation between two variables in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) cor()<br>b) cov()<br>c) sd()<br>d) var()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) cor()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">16. Which function is used to create histograms in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) hist()<br>b) barplot()<br>c) dotchart()<br>d) boxplot()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) hist()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">17. What is the purpose of the lubridate package in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) To manipulate dates and times<br>b) To clean data<br>c) To import data<br>d) To visualize data<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) To manipulate dates and times<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">18. Which function is used to merge two data frames in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) join()<br>b) merge()<br>c) append()<br>d) concat()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) merge()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">19. Which function is used to calculate the standard error in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) sd()<br>b) se()<br>c) stderr()<br>d) stdev()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) stderr()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">20. Which function is used to create scatterplots in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) scatterplot()<br>b) plot()<br>c) scatter()<br>d) scatterplotmatrix()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) plot()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">21. Which function is used to calculate the variance in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) sd()<br>b) se()<br>c) stderr()<br>d) var()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) var()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">22. Which package is used for time series analysis in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ggplot2<br>b) dplyr<br>c) lubridate<br>d) forecast<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) forecast<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">23. Which function is used to calculate the standard deviation in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) sd()<br>b) se()<br>c) stderr()<br>d) stdev()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) sd()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">24. Which function is used to create boxplots in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) hist()<br>b) boxplot()<br>c) barplot()<br>d) scatterplot()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) boxplot()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">25. What is the purpose of the tidyr package in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) To manipulate data frames<br>b) To visualize data<br>c) To import data<br>d) To clean data<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) To clean data<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">26. Which function is used to calculate the mode in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) mean()<br>b) median()<br>c) mode()<br>d) max()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) mode()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">27. Which function is used to create a scatterplot matrix in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) scatterplotmatrix()<br>b) pairs()<br>c) plotmatrix()<br>d) scatterplot()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) pairs()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">28. Which function is used to calculate the confidence interval in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ci()<br>b) confidence()<br>c) confint()<br>d) interval()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) confint()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">29. Which package is used for data manipulation in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ggplot2<br>b) dplyr<br>c) tidyr<br>d) reshape2<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) dplyr<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">30. Which function is used to calculate the coefficient of determination in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) r()<br>b) c()<br>c) cd()<br>d) cor()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) cor()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">31. What is the purpose of the reshape2 package in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) To manipulate data frames<br>b) To visualize data<br>c) To import data<br>d) To clean data<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) To manipulate data frames<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">32. Which function is used to calculate the skewness in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) skew()<br>b) skewness()<br>c) kurt()<br>d) kurtosis()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) skewness()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">33. Which package is used for data visualization in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ggplot2<br>b) dplyr<br>c) tidyr<br>d) reshape2<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) ggplot2<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">34. Which function is used to calculate the kurtosis in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) skew()<br>b) skewness()<br>c) kurt()<br>d) kurtosis()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) kurtosis()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">35. Which function is used to create density plots in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) hist()<br>b) plot()<br>c) density()<br>d) boxplot()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) density()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">36. What is the purpose of the readr package in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) To manipulate data frames<br>b) To visualize data<br>c) To import data<br>d) To clean data<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) To import data<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">37. Which function is used to calculate the chi-squared test in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) chisq.test()<br>b) chi()<br>c) chi2()<br>d) chi.squared()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) chisq.test()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">38. Which package is used for data reshaping in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ggplot2<br>b) dplyr<br>c) tidyr<br>d) reshape2<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) tidyr<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">39. Which function is used to calculate the t-test in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) t.test()<br>b) t()<br>c) ttest()<br>d) test()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) t.test()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">40. Which function is used to calculate the ANOVA in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) aov()<br>b) anova()<br>c) analysis()<br>d) test()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) aov()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">41. Which function is used to calculate the Mann-Whitney U test in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) wilcox.test()<br>b) mann-whitney()<br>c) mwu.test()<br>d) test()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) wilcox.test()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">42. Which package is used for statistical modeling in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ggplot2<br>b) dplyr<br>c) tidyr<br>d) statsmodels<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) statsmodels<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">43. Which function is used to calculate the chi-squared goodness of fit test in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) chisq.test()<br>b) chi()<br>c) chi2()<br>d) chi.squared()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) chisq.test()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">44. Which function is used to calculate the Pearson correlation test in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) pearson.test()<br>b) corr.test()<br>c) p.test()<br>d) test()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) corr.test()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">45. Which package is used for machine learning in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ggplot2<br>b) dplyr<br>c) tidyr<br>d) caret<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) caret<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">46. Which function is used to calculate the Wilcoxon rank sum test in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) wilcox.test()<br>b) ranksum()<br>c) wrs.test()<br>d) test()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) wilcox.test()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">47. Which function is used to calculate the Kruskal-Wallis test in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) kruskal.test()<br>b) kruskal()<br>c) kw.test()<br>d) test()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) kruskal.test()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">48. Which package is used for time series forecasting in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ggplot2<br>b) dplyr<br>c) forecast<br>d) stats<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) forecast<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">49. Which function is used to calculate the logistic regression in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) glm()<br>b) lm()<br>c) logit()<br>d) regression()<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) glm()<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">50. Which package is used for data clustering in R?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a) ggplot2<br>b) dplyr<br>c) tidyr<br>d) cluster<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) cluster<\/h4>\n","protected":false},"excerpt":{"rendered":"<p>1. What is R used for? a) Web developmentb) Data analysisc) Mobile app developmentd) Game development Answer: b) Data analysis [&hellip;]<\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10101","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Top 50 R Language Interview Questions with Answers - scmGalaxy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-r-language-interview-questions-with-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 50 R Language Interview Questions with Answers - scmGalaxy\" \/>\n<meta property=\"og:description\" content=\"1. 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