In the context given, what would a t test help determine between two groups of men in an experiment involving stress levels after watching piano recitals? a. The accuracy of the stress level measurements. b. The increase in stress levels in the experimental group. c. The probability that the difference in stress levels is due to the magic pill. d. The effectiveness of the piano recitals in reducing stress.What is the purpose of the alternative hypothesis (H1) in statistical hypothesis testing? a. To guarantee that the null hypothesis will be rejected by the statistical test. b. To confirm the accuracy of the null hypothesis. c. To serve as a default statement that is assumed to be true from the start. d. To assert a statement about the population parameter that stands in opposition to the null hypothesis