Appropriate Conclusions For each of the following situations, decide if it is valid or invalid to use a confidence interval based on the T-model to estimate the population mean. Flag question: Question 1 Question 1 2 pts Situation A: In order to estimate , the mean annual salary of high-school teachers in a certain state, a statistics student selected a random sample of 150 teachers from the state. The student found the sample mean and standard deviation for the teachers' salaries. Group of answer choices Invalid Valid