If a constant value is added or subtracted to either variable, the correlation coefficient would be unchanged. 10. MCQ quiz on Big Data Hadoop MCQ multiple choice questions and answers, objective type question and answer on hadoop quiz questions with answers test pdf for competitive and entrance written exams for freshers and experience candidates in software and IT technology. MCQ quiz on Data Science multiple choice questions and answers on data science MCQ questions quiz on data science objectives questions with answer test pdf. D) Significance level = sqrt (1 – Confidence level). Hence, curve 1 has the least standard deviation. Viewing output from data analysis. Alternate hypothesis is that listening to music does improve memory. B) To answer this one we need to go to the basic definition of a median. Type 1 error means that we reject the null hypothesis when its actually true. Here the null hypothesis is that music does not improve memory. Data Sufficiency MCQ Question with Answer Data Sufficiency MCQ with detailed explanation for interview, entrance and competitive exams. Developed by, Big Data Hadoop Objective Questions and Answer. A. F statistic is the value we receive when we run an ANOVA test on different groups to understand the differences between them. Do check that you are taking Z- value as 0.5 or 1.5!! σ1, σ2 and σ3 represent the standard deviations for curves 1, 2 and 3 respectively. If we introduce outliers into the data, the standard deviation increases, and hence the confidence interval also increases. Type 1 error would be that we reject it and say that music does improve memory when it actually doesn’t. (adsbygoogle = window.adsbygoogle || []).push({}); This article is quite old and you might not get a prompt response from the author. After a 20 minutes lecture of both groups, a test is conducted for all the students. ASWDC (App, Software & … … R Quiz Questions. On the other hand, inferential statistics helps us to infer properties of the population from a given sample of data. A strong positive correlation would occur when the following condition is met. A monotonic relationship is one where the variables change together but not necessarily at a constant rate. Explanation are given for understanding. We would calculate the Z score accordingly and then use it to find the probabilities ! Option B shows a strong positive relationship. This is a compulsory subject in … Though sometimes causation might be intuitive from a high correlation but actually correlation does not imply any causal inference. These data analyst interview questions will help you identify candidates with technical expertise who can improve your company decision making process. I was thinking answer should be A. C) 2 and 3 Statistics forms the back bone of data science or any analysis for that matter. The formula for R2 given by. B) Decrease B) Confidence interval will increase with the introduction of outliers. The coefficient of determination is the R squared value and it tells us the amount of variability of the dependent variable explained by the independent variable. For Question 4.) ANALYTICAL REASONING Mcqs for NTS. In case of multivariate regression the r squared value represents the ratio of the sum of explained variance to the sum of total variance. B) Prediction Error We shall be happy to incorporate your ideas in further articles and tests. E) None of the above. He divides 20 students into two groups of 10 each. D) +/- 2.55, We need to look at the z table for answering this. i.e. 38) The line described by the linear regression equation (OLS) attempts to ____ ? Remember that we can never find probabilities for value being exactly equal to a particular value in case of distribution functions. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. This may or may not be achieved by passing through the maximum points in the data. Please share your thoughts on the above topics and also your feedback. Input to the _______ is the sorted output of the mappers. The R square always increases or at least remains constant because in case of ordinary least squares the sum of square error never increases by adding more variables to the model. Therefore X = 150+20*1.5 = 180. Clustering is a method in which … C) If the doctor makes all future patients diet in a similar way, the mean blood pressure will fall below 160. DATA MINING Multiple Choice Questions and Answers :-1. As companies move past the experimental phase with Hadoop, many cite the need for additional capabilities, including _______________ a) Improved data storage and information retrieval b) Improved extract, transform and load features for data integration c) Improved data … Q-30-Correct answer is 86% which is shown in the answers however option chosen seems to be wrong. The Statistics questions and answers and notes are excellent to understand. Hi, Regarding #17, I think it should be at 90% confidence level, since we are doing a one-tailed test with alpha or significance level at 5%, because CL = 1 – (2*alpha) in this case. Hive also support custom extensions written in : 8. If we add a constant value to all the values of x, the xi and  will change by the same number, and the differences will remain the same. 2. The F statistic is given by the ratio of between group variability to within group variability. Let’s perform the Z test on the given case. It’s basically done when we’re trying to estimate the population standard deviation using the sample standard deviation. MULTIPLE CHOICE QUESTIONS In the following multiple choice questions, circle the correct answer. A) Dataset is a sample Analyzing unstructured data … Similarly, Curve 1 has a very low range and all the values are in a small range of 80-120. Disagree!! The degrees of freedom in this case would be 10+10 -2 since there are two groups with size 10 each. B)Listening to music significantly improves memory at p. C) The information is insufficient for any conclusion. A Comprehensive Learning Path to Become a Data Scientist in 2021. ________ is the most popular high-level Java API in Hadoop Ecosystem. D) Both might increase or decrease depending on the variables introduced. The t critical value for a 2 tailed test at α = 0.05 is ±2.101. As we can see there are two values for which we can see peaks in the histograms indicating high frequencies for those values. Commonly used Machine Learning Algorithms (with Python and R Codes), 40 Questions to test a data scientist on Machine Learning [Solution: SkillPower – Machine Learning, DataFest 2017], Introductory guide on Linear Programming for (aspiring) data scientists, 6 Easy Steps to Learn Naive Bayes Algorithm with codes in Python and R, 30 Questions to test a data scientist on K-Nearest Neighbors (kNN) Algorithm, 16 Key Questions You Should Answer Before Transitioning into Data Science. Which of the following is a MAE (Mean Absolute Error) for this linear model? Knowledge of both descriptive and inferential statistics is essential for an aspiring data scientist or analyst. This is a two tailed test. a. Larry Page b. Doug Cutting c. Richard Stallman d. Alan Cox 2. A relationship is linear when a change in one variable is associated with a proportional change in the other variable. How To Have a Career in Data Science (Business Analytics)? Thanks. We can calculate the Z value for the given mean. C) None of these. The t statistic obtained is 3.191. Research Methodology b. B) Concluding that listening to music while studying improves memory when it actually doesn’t. As we can see for a positively skewed curve, Mode