Please answering the following question, thank you!

Answer questions 9-10 based on the information of the following: Based on a sample (n = 100), the 90% confidence interval for a population mean u is [8, 10] (assuming population standard deviation is known). Which among the following statements is/are correct? i) 90% of observations in the sample lie in [8, 10] ii) The sample mean is 9 iii) The SD for sample mean is 1 O i) and ii) O i) only O ii) only O ii), and iii) O i) and iii) O i), ii) and iii) QUESTION 10 Based on the same sample, for the test of Ho: H 2 11 vs. H :