(Answered) If a sample comes from a normal distribution thenbspt-test

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If a sample comes from a normal distribution the t-test, Sign Test, and WSRT are all applicable. Which of these tests should you use? Why?
Suppose the samples in (a) and (b) below come from a symmetric distribution. Explain in each case why the WSRT for Ha: M =/ 30 would not be valid.

(a) 23, 25, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 43, 45

(b) 20, 20, 20, 20, 20, 40, 40, 40, 40, 40

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