If the alpha level is changed from o =.01 to o = .05, what happens to the critical value in a right-sided test? It decreases It increases It stays the sameA high school in Montreal wants to test whether a lunch program focused on providing free meals to students has an impact on their grades on a final exam. To evaluate the effectiveness of this program, a random sample of n=52 students are required to participate in the lunch program. At the end of the year, all students take the same final exam. The average score of the sample is M=84. For the general population of students, the final exam scores form a normal distribution with a mean of p = 81 and a standard deviation of 0' = 10. What can you conclude after conducting a two-tailed hypothesis test (at =.05). O Rejection of the null hypothesis, the lunch program does not have a significant effect on students' grades. 0 Failure to reject the null hypothesis, the lunch program has a significant effect on students' grades. 0 Rejection of the null hypothesis, the lunch program has a significant effect on students' grades. 0 Failure to reject the null hypothesis, the lunch program does not have a significant effect on students' grades. A researcher uses a hypothesis test to evaluate HO: u = 70. Which combination of factors is most likely to result in rejecting the null hypothesis? Oo = 4 and n = 40 Oo = 4 and n = 80 Oo = 10 and n = 40 Oo = 10 and n = 80