FREE Data Science Knowledge Questions and Answers
What makes data scientists benefit from data sampling?
Data sampling can condense a large, unmanageable data set into a smaller, more manageable size if examining the entire set would be challenging or take too much time. Representative samples can be produced using a variety of techniques, depending on the specific data set and intended analytics application. When done correctly, data sampling generates more efficient and accurate findings than it could otherwise. However, data scientists must ensure that samples appropriately reflect the data overall in order to prevent sampling errors.
Select the option that centers around identifying unknown properties in the data from the list below.
Finding patterns, correlations, anomalies, and insights within huge datasets is known as data mining. Clustering, association rule mining, and anomaly detection are common methods used in this process. The goal of this investigation is to find information that has never been found before that may be useful for making decisions and comprehending the fundamental properties of the data.
The basis for inference engines' operation is?
"Depending on the particular problem and system architecture, inference engines can use both forward and backward chaining.
Working backward from a goal or conclusion to identify the collection of facts or regulations that support it is known as ""backward chaining.""
Forward chaining is a process that begins with known facts and progresses toward a goal by applying rules to infer additional information."
Select the appropriate use of data science in healthcare from the list below.
"Data science is used in the medical field for a number of reasons:Â
Genomics: The study of genetic information to comprehend illness and tailor therapy.
Medical imaging: The diagnosis and treatment of medical pictures by machine learning interpretation.
Drug discovery is the process of mining data to find possible medications and streamline the development process."
Which programming language is most frequently used by data scientists among the following?
An annual survey on data science and machine learning by Google subsidiary Kaggle indicates that Python is the most popular programming language among data scientists, followed by SQL and R. Although Julia is a more recent language, it's still one of the best resources and tools available to data scientists. The list contains a range of Python frameworks and modules that can be used to enable analytics applications and data visualization, reflecting Python's position as the most popular language.
What is a widely held belief regarding data scientists?
For the majority of data scientists, gathering pertinent data and getting it ready for analysis are labor-intensive tasks. It is frequently necessary to combine and consolidate data sets from several source systems. The data preparation process entails a number of phases, including data transformation, enrichment, and validation as well as data profiling and cleansing procedures to address issues with data quality. Although this process is time-consuming, it is an essential step before developing accurate data science applications.
What distinguishes a data scientist from a data engineer, in the main? What distinguishes a data scientist from a data engineer, in the main?
When it comes to finding, preparing, and evaluating pertinent data, data scientists take the lead. However, they frequently receive support from data engineers, who simplify analytics projects by taking care of a large portion of the preliminary work needed to get data into the hands of data scientists. They may assist with the implementation and upkeep of analytical models in addition to building data pipelines that combine data from many source systems, integrate, clean, and prepare the data for analysis. In addition to helping with the analytics process, data analysts, machine learning engineers, and data architects are frequently included in data science teams.
Choose the model that serves as the industry standard for data analysis.
Understanding cause-and-effect linkages between variables in data analysis is referred to as "causal" modeling. Causal modeling seeks to establish whether changes in one variable lead to changes in another, whereas inferential modeling is more concerned with forecasts or judgments about a population. Understanding the effects of actions, policies, or treatments requires the use of causal inference.
What is the process's initial stage in data science?
Finding a business-related hypothesis to test and comprehending the goals and requirements of the enterprise are the first steps in creating a machine learning or statistical model that provides meaningful information. This is true even in situations where data scientists aren't assigned particular business concerns to address. The next steps in the data science process are gathering and preparing the data, testing out several analytical models, implementing the best model to analyze the data, and presenting the findings to operational staff and business executives.
What is the main distinction between supervised and unsupervised learning in machine learning?
Two popular approaches to machine learning are supervised and unsupervised learning. In supervised learning, a machine learning model is trained to generate a certain output using labeled and classed training data. Enabling the model to recognize certain correlations and patterns in bigger data sets is the aim. On the other hand, unsupervised learning involves a data scientist using unlabeled and unclassified training data to run an algorithm. The machine learning model gathers data together and finds similarities and patterns on its own because the desired output is unknown. A hybrid method called semi-supervised learning uses labeled training data in part.
Which of the following sums up data science's main objective the best?
The core of data science is encapsulated in this statement: it entails the extraction of valuable knowledge and insights from data in order to inform decisions, enhance workflows, and accomplish organizational goals.