A school newspaper article claims that the mean weight of student backpacks is 20 pounds. A student of this school would like to test the hypotheses H Subscript 0 Baseline: mu= 20 versus H Subscript alpha Baseline: mu not-equals20 where μ = the true mean weight of all backpacks using a random sample of 30 students. The power of this test to reject the null hypothesis when μ = 19.5 is 0.78 when a significance level of 0.05 is used. Which of the following would increase the power of this test? decrease the significance level to 0.01
decrease the sample size to 25 students
increase the sample size to 50 students
increase the alternative value of the parameter to μ = 19.75