Which of the following is an appropriate hypothesis? O a) HO: H = 9.8 versus Ha: H # 9.5 (b) HO: H = 9.8 versus Ha: H 9.5 O d) HO : x = 9.8 versus Ha : x > 9.8A random sample of 28 U.S. adults finds they have an average height of 170.12 cm with sample standard deviation 9.8 cm. State the null hypothesis and find the TS, p- value, and decision for testing whether the average height of an American adult differs from 175 cm using a 0.10 level of significance. O a) TS = -2.39; p-value = 0.026 (or 0.020