B. suppose it was previously believed that the mean magnitude of seismic events off the coast of fiji is 4.3 on the richter scale. use the data in the mag variable of the ready-to-use quakes data set, providing 1,000 sampled seismic events in that area, to test the claim that the true mean magnitude is in fact greater than 4.3. set up appropriate hypotheses, use t. test (conduct the test at a significance level of α = 0.01), and draw a conclusion.