Suppose we are testing the null hypothesis H. = 50 against the alternative H. - 50 for an approximately Normal population. A random sample of nine observations are drawn from the population. The sample mean of these observations is 7= 53 with a standard deviation of s = 6.48. Which of the following is the value of the test statistic for a one sample t lest? 0 53-50 648 3 O 1 = 53-50 6.48 3 O 50-53 6.48 3 O 50-53 1 = 6 48 V 3 O , 53-50 V6.48 9