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You conduct a hypomesis test about a population mean u with the following null and alternative hypotheses: Ho: u=15.? H1: u*15.? Suppose that the population standard deviation has a known value of o = 13.5. You obtain a sample of n = 89 observations, which provides a sample mean ofi = 18.1. Since the sample size V large enough, you V assume that the sample mean it follows a normal distribution. Let Llo denote the hypothesized value of the population mean u when the null hypothesis is true. Click on the blue dropdown menus that follow, and select the appropriate expressions to obtain the correct formula for the test statistic for your hypothesis test: when the null hypothesis is true , the test statistic for this hypothesis test follows which of the following distributions? 0 A normal distribution with mean I] and standard deviation 1 O A t distribution with 89 degrees of freedom 0 A normal distribution with mean 15.? and standard deviation 13.5 0 A t distribution with as degrees of freedom The value of the test statistic is V