Question 12 1 pts A sample of size n=150 is to be used to test the following hypothesis at the level of significance 0.02. HO: mu = 8.3 versus Ha: mu is not equal to 8.3. where mu is the true average weight of a newborn American baby. Give the appropriate rejection region. Let T = (bar(X} - mu) / (5/sqrt[n]) where, bar(X} = sample mean and sqrt(n) is the square root of n. T > 2.325 or T 1.96 orT 2.575 orT 148.4 T = (bar[X] - mu) / (5/sqrt[n]) Since the observed value of the test statistics T_(obs] = -1.845 and T_[obs] - 2.325, we cannot reject HO.Question 14 1 pts To check the average cost to repair a bridge, a random sample of n=55 bridges was chosen. The mean and standard deviation for the sample are $25,788 and $1,540, respectively. Records from previous years indicate an average bridge repair cost was $25,003. Use the sample data to test that the mean repair cost is greater than $25,003 at the level of significance 0.05. Let T_fobs} denote the observed value of the test statistics you use for testing the hypothesis. O T_fobs] = 28.03, since T_fobs] > 1.96 we conclude that the average bridge repair cost is less than $25,003. ( T_fobs] = 28.03, since T_(obs] > 1.645 we conclude that the average bridge repair cost is greater than $25,003. O T_fobs] = 3.78, since T_fobs] > 1.96 we conclude that the average bridge repair cost is greater than $25,003. O T_fobs] = 3.78, since T_(obs] > 1.96 we conclude that the average bridge repair cost is less than $25,003. O T_fobs] = 3.78, since T_fobs] > 1.645 we conclude that the average bridge repair cost is greater than $25,003. O T_fobs] = 28.03, since T_(obs] > 1.96 we conclude that the average bridge repair cost is greater than $25,003. O T_fobs] = 3.78, since T_[obs] > 1.645 we conclude that the average bridge repair cost is less than $25,003. ( T_fobs] = 28.03, since T_fobs] > 1.645 we conclude that the average bridge repair cost is less than $25,003