18 and 19 please

Question 18 (5 points) A simple random sample of 9 items resulted in a sample mean of 30. The population variance is 225. Compute the 90% confidence interval for the margin of error. a) 0219 b) 9.8 c) 8.225 d) 16,45 Question 19 (5 points) The 7 value with a 95% confidence and 34 degrees of freedom is 02.035 2.064 1.691 2.032