Google Data Analytics Professional Certification Practice Test

What is hypothesis testing used for?

1. To validate the accuracy of data

2. To analyze the reliability of a sample

3. To determine the effects of variables

4. To organize data for clarity

The correct answer is: To determine the effects of variables

Hypothesis testing is a statistical method used to determine the effects of variables by assessing whether observed data provides sufficient evidence to support or reject a specific hypothesis about a population. This process involves formulating a null hypothesis (typically suggesting no effect or no difference) and an alternative hypothesis (indicating some effect or difference). By analyzing sample data and calculating a p-value, researchers can determine if the evidence is strong enough to reject the null hypothesis in favor of the alternative. This method is particularly valuable in experiments and studies where the impact of one or more independent variables on a dependent variable is being evaluated. For instance, in a clinical trial, hypothesis testing may help determine whether a new drug significantly affects patient outcomes compared to a placebo. The other choices relate to different aspects of data analysis. Validating the accuracy of data involves checking for errors and inconsistencies in data entry or collection, while analyzing the reliability of a sample focuses on how well a sample represents the larger population. Organizing data for clarity relates to data management practices rather than testing hypotheses about relationships or effects. Thus, hypothesis testing is specifically aimed at examining the effects of variables, making it the most relevant choice.