Q1) If null hypothesis is rejected by using a one-tailed test, then it surely would be rejected if researcher had used two-tailed test.

a) True

b) False

Q2) Which combination of factors produces smallest risk of Type I error?

a.α= .05 with n = 20 and α = 10

b.α= .05 with n = 20 and α = 20

c. α= .05 with n = 100 and α = 10

d. The three other options all have the same risk.

Q3) A researcher administers treatment to sample of n = 25 participants and uses a hypothesis tests to estimate effect of the treatment. Hypothesis test produces a z-score of z = 2.37. Suppose that researcher is using two-tailed test, what decision must be made?

a) Researcher must reject the null hypothesis with α = .05 but not with α= .01

b) Researcher must reject the null hypothesis with either α= .05 or α = .01

c) Researcher must fail to reject H₀ with either α = .05 or α= .01

d) Cannot answer without additional information.