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Question 44/147
A data scientist is given an R data frame, "empdata", with the columns Age, Salary, Occupation, Education, and Gender. The data scientist would like to examine only the Salary and Occupation columns for ages greater than 40.
Which command extracts the appropriate rows and columns from the data frame?
Which command extracts the appropriate rows and columns from the data frame?
Correct Answer: B
- Question List (147q)
- Question 1: What is a motivation for using a data analytics lifecycle?...
- Question 2: You have created a Logistic Regression model to predict cust...
- Question 3: Your organization has a website where visitors randomly rece...
- Question 4: What is a business driver for Big Data analytics adoption?...
- Question 5: You have been assigned to run a logistic regression model fo...
- Question 6: In MADlib what does MAD stand for?...
- Question 7: Which process in text analysis can be used to reduce dimensi...
- Question 8: Since R factors are categorical variables, they are most clo...
- Question 9: You have been assigned to run a linear regression model for ...
- Question 10: In which lifecycle stage are initial hypotheses formed?...
- Question 11: What is the similarity between the matrix and array data str...
- Question 12: Which activity is performed in the Operationalize phase of t...
- Question 13: Which participant in a data analytics project is typically r...
- Question 14: What is an appropriate data visualization to use in a presen...
- Question 15: After running a density plot you realize that the data has a...
- Question 16: You have run the association rules algorithm on your data se...
- Question 17: While having a discussion with your colleague, this person m...
- Question 18: Refer to the exhibit. (Exhibit) You are using K-means cluste...
- Question 19: Before building an ARMA model, how can you determine if the ...
- Question 20: The web analytics team uses Hadoop to process access logs. T...
- Question 21: Refer to the exhibit. (Exhibit) You are using k-means cluste...
- Question 22: What requests resources from YARN during a MapReduce job?...
- Question 23: When would you use GROUP BY ROLLUP clause in your OLAP query...
- Question 24: After which phase of the data analytics lifecycle should you...
- Question 25: What does the Receiver Operating Characteristic (ROC) curve ...
- Question 26: Consider a database with the following four transactions: Tr...
- Question 27: The web analytics team uses Hadoop to process access logs. T...
- Question 28: What does the R code z <- f[1:10, ] do?...
- Question 29: Refer to the exhibit. (Exhibit) You are building a decision ...
- Question 30: Which chart type is the most effective way to show trends ov...
- Question 31: Which two analytical methods can be used for dealing with ca...
- Question 32: A call center for a large electronics company handles an ave...
- Question 33: You are asked to create a model to predict the total number ...
- Question 34: (Exhibit) Refer to the exhibit. To predict whether or not a ...
- Question 35: What is a key consideration when preparing a presentation in...
- Question 36: Consider the following SQL statement: SELECT employee_id, ye...
- Question 37: You have been assigned to perform a study of the daily reven...
- Question 38: You need to run a hypothesis test across three normally dist...
- Question 39: Which word or phrase completes the statement; "Excessive emp...
- Question 40: Refer to the exhibit. (Exhibit) What is the approximate R-sq...
- Question 41: What is part of the model output for a linear regression?...
- Question 42: You submit a Map Reduce job to a Hadoop cluster. However, yo...
- Question 43: When is the GROUP BY ROLLUP clause used in an OLAP query?...
- Question 44: A data scientist is given an R data frame, "empdata", with t...
- Question 45: In a Student's t-test, what is the meaning of the p-value?...
- Question 46: You are analyzing a time series and want to determine its st...
- Question 47: What is the purpose of applying the naive Bayes conditional ...
- Question 48: How is HDFS defined?
- Question 49: What is one modeling or descriptive statistical function in ...
- Question 50: In time series analysis, what function is examined to identi...
- Question 51: What describes the data repository represented by the 'A' in...
- Question 52: Which R data structure allows elements to have different dat...
- Question 53: Which chart type is intended to display correlations between...
- Question 54: Which word or phrase completes the statement? Business Intel...
- Question 55: In logistic regression modeling, what is the commonly assign...
- Question 56: Refer to the exhibit. (Exhibit) You have scored your Naive b...
- Question 57: What is the output of the K-means clustering algorithm?...
- Question 58: What is a characteristic of an analytic sandbox?...
- Question 59: In text analysis, what makes the corpus representation dynam...
- Question 60: A data scientist plans to classify the sentiment polarity of...
- Question 61: Refer to the exhibit. (Exhibit) The graph represents an ROC ...
- Question 62: When creating a project sponsor presentation, what is the ma...
- Question 63: (Exhibit) Refer to the exhibit. What is the approximate R-sq...
- Question 64: You have run a Linear Regression model on the data shown in ...
- Question 65: A data scientist is given an R data frame (i.e., empdata) wi...
- Question 66: You have been assigned to run a Logistic Regression model fo...
- Question 67: A data scientist is asked to implement an article recommenda...
- Question 68: Which phase of the data analytic lifecycle includes conducti...
- Question 69: Refer to the exhibit. (Exhibit) After analyzing a dataset, y...
- Question 70: What is the format of the output from the Map function of Ma...
- Question 71: Refer to the exhibit. (Exhibit) What provides the decision t...
- Question 72: Refer to the exhibit. (Exhibit) In the exhibit, a correlogra...
- Question 73: In time series analysis, what statement describes a MA(q) pr...
- Question 74: The graphic shows the values for the input Boolean attribute...
- Question 75: If your intention is to show trends over time, which chart t...
- Question 76: In ANOVA, what is the null hypothesis for k population means...
- Question 77: MapReduce is designed to process data in which way?...
- Question 78: Data has been collected on visitors' viewing habits at a ban...
- Question 79: The graph represents the plot of WSS as a function of K for ...
- Question 80: What is the primary role of a business intelligence analyst ...
- Question 81: Which data type value is used for the observed response vari...
- Question 82: Which word or phrase completes the statement? Unix is to bas...
- Question 83: Which SQL OLAP extension provides all possible grouping comb...
- Question 84: You are assigned the task of creating customer profiles for ...
- Question 85: What action occurs during feature selection in the model bui...
- Question 86: Executives want to determine whether a change in a shopping ...
- Question 87: In a t-test with unknown variance, what values are used to c...
- Question 88: A logistic regression model is built to determine the probab...
- Question 89: What metrics are used to help calculate relevance in text an...
- Question 90: Which component of a final presentation focuses on how to de...
- Question 91: In which programming language is Hadoop written?...
- Question 92: Which analytic technique would be appropriate to estimate bl...
- Question 93: You have fit a decision tree classifier using 12 input varia...
- Question 94: What converts SQL-like commands into either Tez, Spark, or M...
- Question 95: A fair six-sided die is rolled. Let A denote the event that ...
- Question 96: Based on the exhibit, the table shows the values for the inp...
- Question 97: Which characteristic applies mainly to Data Science as oppos...
- Question 98: You have been assigned to do a study of the daily revenue ef...
- Question 99: What is a key consideration when preparing a presentation in...
- Question 100: Which Hadoop service responds to requests for compute and me...
- Question 101: In addition to quantitative and technical skills, what is a ...
- Question 102: What is a core deliverable at the end of the analytic projec...
- Question 103: Trend, seasonal, and cyclical are components of a time serie...
- Question 104: What is a distinct property of Logistic Regression compared ...
- Question 105: In a Logistic Regression, the coefficient for "age" equals -...
- Question 106: In data visualization, what is used to focus the audience on...
- Question 107: The average purchase size from your online sales site is $17...
- Question 108: There are three criterions for big data analytics projects w...
- Question 109: Consider this SQL statement: SELECT product, prod_cost, avg(...
- Question 110: You are using k-means clustering to classify heart patients ...
- Question 111: Refer to the exhibit. (Exhibit) Click on the calculator icon...
- Question 112: Refer to the exhibit. (Exhibit) You are asked to write a rep...
- Question 113: What is the primary bottleneck in text classification?...
- Question 114: Which activity might be performed in the Operationalize phas...
- Question 115: An IT department deployed a spam filter to reduce the amount...
- Question 116: Which function shown in the exhibit is used to calculate the...
- Question 117: Which statement about linear regression is correct?...
- Question 118: You have been assigned to do a study of the daily revenue ef...
- Question 119: Refer to the exhibit. (Exhibit) In the exhibit, a correlogra...
- Question 120: Refer to exhibit. (Exhibit) You are asked to write a report ...
- Question 121: What are two data categories that represent quantitative dat...
- Question 122: Refer to the exhibit. (Exhibit) In association rules, for it...
- Question 123: Which activity is performed in the Operationalize phase of t...
- Question 124: You are provided with a dataset with the following attribute...
- Question 125: Match each task to its description. (Exhibit)...
- Question 126: Consider the following text: "Stop!" he shouted. "Don't go t...
- Question 127: Which graphical representation shows the distribution and mu...
- Question 128: You are having a discussion with a business colleague. The c...
- Question 129: Assume that you have a data frame in R. Which function would...
- Question 130: A data scientist wants to predict the probability of death f...
- Question 131: You have been given a task to improve sales force compensati...
- Question 132: What are the two data categories that represent qualitative ...
- Question 133: Which functionality do regular expressions provide?...
- Question 134: Consider the example of an analysis for fraud detection on c...
- Question 135: Which data asset is an example of semi-structured data?...
- Question 136: Which analytical method is considered unsupervised?...
- Question 137: How does an HBase data structure differ from an ANSI standar...
- Question 138: What provides the means for matching and manipulating text s...
- Question 139: What is the optimal usage scenario for the Hadoop Distribute...
- Question 140: You have created a scatterplot of two continuous variables f...
- Question 141: Your customer provided you with 2, 000 unlabeled records and...
- Question 142: You have been assigned to do a study of the daily revenue ef...
- Question 143: What is a consideration when building decision trees?...
- Question 144: What are challenges presented by Big Data?...
- Question 145: You have two tables of customers in your database. Customers...
- Question 146: Which visualization technique should be avoided?...
- Question 147: Consider the following text: "Aren't you glad that there are...
