1.Suppose we have a population that is normally distributed, and its standard deviation is unknown. We want totest the following hypotheses: H0:μ=12 vs Ha:μ≠12. If the value of the test statistic is -1.9 based on asample of size 20, what type of test statistic is it and what is the corresponding p-value?
(A)z statistic, 0.0287;
(B)z statistic, 0.0574;
(C) t statistic, between 0.025 and 0.05;
(D) t statistic, between 0.05 and 0.10.