PART A - kindly highlight answers - no explanations required.

A random sample of 16 values is drawn from a mound-shaped and symmetric distribution. The sample mean is 12 and the sample standard deviation is 2. a level of significance of 0.05 to conduct a two-tailed test of the claim that the population mean is 11.5. LA USE SALT (a) Is it appropriate to use a Student's & distribution? Explain. O Yes, because the x distribution is mound-shaped and symmetric and 7 is unknown. O No, the x distribution is skewed left. O No, the x distribution is skewed right. O No, the x distribution is not symmetric. O No, J is known. How many degrees of freedom do we use? (b) What are the hypotheses? OH: M = 11.5; H : M > 11.5 O Ho: M 11.5; H: M = 11.5 O Ho: M = 11.5; H: M 0.250 O 0.100