19. A normal distribution is with known mean μ and unknown variance θ . If we have n samples , the maximum likelihood estimator of θ is (A) (B) (C)(D)

11. To test that per capita GDP of Taiwan in 2019 is no less than twenty thousand US dollars, if the significant level is 5%, which of the following statement is true? (A) Two tailors test is needed. (B) Right tailor is needed. (C) If the P-value is 0.03, then we cannot rejected null hypothesis. (D)For a given sample, the P-value is negatively related to the per capita GDP level that we want to test.

19. A normal distribution is with known mean μ and unknown variance θ . If we have n samples , the maximum likelihood estimator of θ is
(A)
(B)
(C)
(D)

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