Computational statistics

1. Computational statistics is a branch of statistics that focuses on the methods and techniques for analyzing data using computational tools and algorithms. It involves the development and application of statistical models, simulations, and algorithms to analyze and interpret complex datasets. Computational statistics plays a crucial role in various fields such as machine learning, data science, bioinformatics, and image analysis, providing researchers and analysts with the necessary tools to extract meaningful insights from large and complex datasets. By combining statistical theory with computer science techniques, computational statistics enables practitioners to efficiently and accurately analyze data, explore patterns and trends, and make informed decisions based on statistical inference and predictive modeling.

What is a p-value in hypothesis testing?

A) The measure of confidence in the null hypothesis
B) The probability of obtaining results at least as extreme as the observed results, given that the null hypothesis is true
C) The population parameter being tested
D) The significance level for accepting the null hypothesis

2. Which of the following is a parametric statistical test?

A) Mann-Whitney U test
B) Wilcoxon signed-rank test
C) t-test
D) Kruskal-Wallis test

3. What is the purpose of regression analysis in statistics?

A) To examine the relationship between variables
B) To identify outliers in a dataset
C) To test for differences in means
D) To summarize categorical data

4. What does the correlation coefficient measure?

A) The central tendency of a dataset
B) The strength and direction of a linear relationship between two variables
C) The variability within groups
D) The spread of the data

5. What is the purpose of a confidence interval in statistics?

A) To predict future data points
B) To estimate the range within which the population parameter is likely to fall
C) To determine the probability of an event occurring
D) To compare two independent groups

6. Which type of sampling technique involves randomly selecting subjects from a population?

A) Systematic sampling
B) Simple random sampling
C) Convenience sampling
D) Cluster sampling

7. Which regression technique is used when the dependent variable is binary?

A) Linear regression.
B) Logistic regression.
C) Polynomial regression.
D) Ridge regression.

8. What is the significance level in hypothesis testing?

A) The measure of correlation between two variables
B) The level of confidence in the alternative hypothesis
C) The margin of error in the sample mean
D) The probability of rejecting the null hypothesis when it is actually true

9. Which statistical technique is used to predict the value of a dependent variable based on one or more independent variables?

A) Regression analysis.
B) Cluster analysis.
C) Factor analysis.
D) Time series analysis.

10. Which statistical test is used to determine if there is a significant association between two categorical variables?

A) ANOVA.
B) Chi-square test.
C) T-test.
D) Regression analysis.

11. What is the difference between correlation and causation?

A) Correlation indicates a relationship between variables, while causation implies one variable causes a change in the other
B) Correlation measures the strength of a relationship, while causation measures the direction
C) Correlation refers to linear relationships, while causation refers to non-linear relationships
D) Correlation is used for categorical data, while causation is used for continuous data

12. What is the purpose of the Central Limit Theorem in statistics?

A) To determine the variability within groups
B) To calculate the range of a dataset
C) To compare two different samples
D) To state that the sampling distribution of the sample mean approaches a normal distribution as the sample size increases

13. In statistical hypothesis testing, what is the null hypothesis?

A) A statement that predicts an outcome in an experiment
B) A statement that there is no significant difference between specified populations
C) The hypothesis that the researcher believes to be true
D) The hypothesis that is tested using a one-tailed test

14. Which statistical technique is used to deal with missing values in a dataset?

A) Feature engineering.
B) Imputation.
C) Normalization.
D) Outlier detection.

15. Which statistical test should be used to compare the means of more than two independent groups?

A) T-test
B) ANOVA
C) Chi-square test
D) Regression analysis

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