D204 Preassessment Questions and Answers 100% Correct

D204 Preassessment Questions and Answers 100% Correct 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 - Answer- Identifying business needs 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 - Answer- Data Exploration 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 - Answer- Exploratory data analysis 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 - Answer- Detecting missing values 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 - Answer- Cleaning Data 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 - Answer- The SQL queries of data within the tables What can be identified using a box plot? a. frequency b. correlation c. interquartile range d. mean - Answer- Interquartile range 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. - Answer- The analyst will lack insight into the structure of the data set. 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 - Answer- Verification through visualization 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 - Answer- To minimize interruptions from maintenance shutdowns 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 - Answer- predictive analysis 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. - Answer- The model is developed before the research question is known. 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 - Answer- Too little data for training and testing data sets A data analyst has identified combinations of sales transactions that frequently occur together in data over the past 5 years. Which