To test H0​:μ=20 versus H1​:μ<20, a simple random sample of size n=17 is obtained from a population that is known to be normally distributed. Answer parts (a)-(d). Click here to view the t-Distribution Area in Right Tail. (a) If xˉ=18.2 and s=4.2, compute the test statistic. t= (Round to two decimal places as needed.)