Question
In R, which function is used to perform a t-test for
comparing the means of two independent samples?Solution
In R, the t.test() function is used to perform a t-test, which compares the means of two independent groups (samples) to determine if there is a statistically significant difference between them. The t.test() function is versatile and can perform both one-sample and two-sample t-tests. It also provides useful outputs, such as p-values and confidence intervals, to evaluate hypothesis tests for means. Why Other Options Are Wrong : B) anova() : ANOVA is used for comparing the means of more than two groups, not two independent samples. C) lm() : The lm() function is used for linear modeling (regression), not hypothesis testing of means. D) cor.test() : This function is used to test the correlation between two variables, not for comparing sample means. E) chisq.test() : The Chi-squared test is used for categorical data and tests the relationship between observed and expected frequencies, not for comparing means.
Which of the following characteristics best differentiates Big Data from Traditional Data ?
Which of the following best describes the seasonal component in time series data?
In time series decomposition, which component is removed to achieve stationarity?
Which of the following is the best approach for presenting data-driven insights to a non-technical audience?
Which protocol is most commonly used for securing remote access to network devices?
Which of the following transformations is most appropriate to bring all feature values into the range [0,1] for a machine learning model?
...Which of the following is the most appropriate method to handle missing data in a dataset for predictive modeling?
Which Python library is primarily used for data manipulation and analysis, offering tools for reshaping, merging, and aggregating datasets?
A company divides its employees into departments (e.g., HR, IT, Marketing) and then selects random samples from each department for a satisfaction surve...
In time series forecasting, which of the following is true regarding the impact of autocorrelation on the model?
