(b) Let X denote the sample average compressive strength for n = 13 randomly selected specimens. Consider the test procedure with test statistic X itself (not standardized). What is the probability distribution of the test statistic when H, is true? The test statistic has a gamma distribution. The test statistic has a normal distribution. The test statistic has an exponential distribution. The test statistic has a binomial distribution. If X = 1,340, find the P-value. (Round your answer to four decimal places.) P-value = 0.2643 Should Ho be rejected using a significance level of 0.01? reject Ho do not reject Ho (c) What is the probability distribution of the test statistic when = 1,350 and n = 13? The test statistic has a binomial distribution. The test statistic has a gamma distribution. The test statistic has an exponential distribution. The test statistic has a normal distribution. State the mean and standard deviation (in KN/m) of the test statistic. (Round your standard deviation to three decimal places.) mean 1350 KN/m standard deviation 67 X KN/m