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QUESTION T The distribution of ages of of commercial buildings in Abu Dhabi is skewed to the left. What happens to the sampling distribution of sample mean as the sample size goes from n = 25 to n = 15D? The mean of it stays the same, the standard error of it becomes smaller. and the sampling distribution of the sample mean becomes approximately normal. The mean of it stays the same, the standard snow of 5: becomes larger. and the sampling distribution of the sample mean becomes exactly normal. The mean of it stays the same. the standard error of it becomes smaller. and the sampling distribution of the sample mean becomes exactly nonnal. The mean of it gets closer to the population mean. the standard error of of it becomes larger, and the sampling distribution of the sample mean becomes approximately normal. QUESTION 8 An insurance company proposes two health insurance plans for the employees of a company. Plan A is the basic plan and covers only the medication expenses in case of hospitalization. whereas Plan B reimburses all medical expenses of the employees. As a human ressources manager, you are required to estimate how many employees will opt for Plan B. The manager randomly asks 4? emplyees and 21 of them prefer Plan E. Find the WW (LCL) of the 93% condence interval estimate for the population proportion of employees who will prefer Plan B. Round your answer to m decimal places. uuesllun 9 Aisha wants to estimate the average study time per week for students in MAT213 course. To accomplish that she randomly selects 50 such students and records their weekly study times in hours. Assume that the weekly study times are right-skewed. Which distribution should be used to construct the condence interval? t-distribution with 50 degrees of freedom. Standard normal distribution. Neither standard normal distribution nor t-distribution. t-distribution with 49 degrees of freedom. QUESTION 10 How would a 99% z-interval compare to a 99% t-interval? The z-interval would be nan'ower than the t-interval. The zinterval would be wider than the t-interval. Both intervals are identical. The middle of the Hnterval is greater than the middle of the t-interval. QUESTION 1 1- ln which of the following situations we can notconstruct a condence interval for the population proportion ,1}? F293 and n=300. x=8 and n=5(}. x=9 and I1: 24. x=2T5 and n=325