D204 exam questions and answers 2024

D204 Identifying business needs - ANSWER Which activity does an analyst perform in the discovery phase of the data analytics life cycle? a. Collecting Data b. Cleaning Data c. Identifying outliers d. Identifying business needs Data Exploration - ANSWER In which phase of the data analytics life cycle does an analyst build a histogram? a. Data acquisition b. Data exploration c. Discovery d. Predictive modeling Exploratory data analysis - ANSWER An analyst applies a statistical formula to obtain the average temperature for a city over the last 50 years. Which phase of the data analytics life cycle is represented by this activity? a. Data acquisition b. Exploratory data analysis c. predictive modeling d. Data reporting Detecting missing values - ANSWER An analyst has been tasked with defining data columns that could contain null values. Which activity of the data acquisition phase is represented? a. collecting data b. disqualifying data sources c. detecting missing values d. transforming improperly formatted text Cleaning Data - ANSWER Which activity in the data analytics life cycle occurs during the data acquisition phase and requires the most time and effort from the data analyst? a. selecting the data sources b. importing data into a database c. cleaning data defining goals The SQL queries of data within the tables - ANSWER What might be developed by data analysts when acquiring data from a data warehouse? a.The procedures for extracting files from the data warehouse b. The procedures for updating tables in the data warehouse c. The relational structure of tables d. The SQL queries of data within the tables Interquartile range - ANSWER What can be identified using a box plot? a. frequency b. correlation c. interquartile range d. mean The analyst will lack insight into the structure of the data set. - ANSWER What will be a consequence of poor attention to detail during the data exploration phase? a. Not enough variables will be considered in the analysis. b. The outcome of the analysis will be misaligned to business needs. c. The analyst will lack insight into the structure of the data set. d. The model will be built using the wrong data set. Verification through visualization - ANSWER Which aspect of data exploration occurs when an analyst writes code to compile a bar graph of dog food sales per month? a. Performance of a correlation analysis b. Analysis of data anomalies c. Verification through visualization d. Determination of variabilities To minimize interruptions from maintenance shutdowns - ANSWER How does the predictive model serve this oil company? a. To minimize interruptions from maintenance shutdowns b. To minimize the need for workforce safety training c. To improve compliance with pipeline construction standards d. To improve compliance with pipeline disposal standards predictive analysis - ANSWER During which phase in the data analytics life cycle would a churn analysis be performed? a. data cleaning b. data acquisition c. predictive analysis d. representation and reporting The model is developed before the research question is known. - ANSWER Which mistake is commonly made during the predictive analytics phase? a. The data are separated into different sets. b. The variables are separated into response and independent variables. c. The data are prepared before the model is developed. d. The model is developed before the research question is known. Too little data for training and testing data sets - ANSWER Why might a data analyst resample a data set with replacement data in a data mining project? a. Misidentification of causation due to correlation b. Wrong variables chosen for analyzation c. Too little data for training and testing data sets d. Skewed data resulting from outliers data mining - ANSWER A data analyst has identified combinations of sales transactions that frequently occur together in data over the past 5 years. Which phase of the data analytics life cycle is represented by this analysis? a. data acquisition b. representation and reporting c. data mining d. predictive modeling Data mining - ANSWER An analyst realizes that the data set has been reduced significantly, resulting in sample sizes that are too small. In which phase of the data analytics life cycle did this likely occur? a. data exploration b. data modeling c. data mining d. data discovery Excluding unrelated data - ANSWER What strategy will contribute to effective data representation and reporting? a. Creating a new training data set b. Selecting data for a prediction model c. Excluding unrelated data d. Extracting data from source repositories 1. Provide actionable insights that can inform decision-making 2. Provide the conclusions from the analysis in an engaging manner - ANSWER What are two purposes of the reporting phase of the data analytics life cycle? a. Provide the conclusions from the analysis in an engaging manner b. Provide a tool for decision-makers to import and analyze more data c. Provide actionable insights that can inform decision-making d. Provide an automated way for decision-makers to test their own models Data reporting - ANSWER During which phase of the data analytics life cycle does an analyst create a story to report data? a. data acquisition b. data mining c. data reporting d. data cleanin