30. Statistical hypothesis testing involves testing the:a. research hypothesis.b. significance level.c. null hypothesis.d. probability level.

Statistical hypothesis testing assesses any hypothesis's plausibility through the usage of the sample data. It basically denotes any assumption made relying on any evidence. The null hypothesis denotes that there is no existing statistical significance in a given set of observations and the alternative hypothesis denotes that there is existing statistical significance in a given set of observations.The correct option that has testing involved in the statistical hypothesis testing must be determined.The correct answer is c. null hypothesis.The null hypothesis is tested against the alternative hypothesis to determine whether the observed data is statistically significant or not.a. Research hypothesis is not tested in statistical hypothesis testing. The null hypothesis is tested against the alternative hypothesis.b. Significance level is not tested in statistical hypothesis testing. The significance level denotes the probability of any event occurring by chance. It is the probability of rejecting the null hypothesis when it is actually true.d. Probability level is not tested in statistical hypothesis testing. The -value states the chances of finding a particular observation set given that the null hypothesis is true. It validates a hypothesis against the observed data.Statistical hypothesis testing involves testing the c. null hypothesis.