Question 6 A gunlike apparatus has recently been designed to replace needles in administering vaccines. The apparatus can be set to inject different amounts of the serum, but because of random uctuations the actual amount injected is normally distributed with a mean equal to the setting and with an unknown variance 02. It has been decided that the apparatus would be too dangerous to use if or exceeds 0.10. If a random sample of 50 injections resulted in a sample standard deviation of 0.08, should use of the new apparatus be discontinued? Suppose the level of signicance is a = O. 10. Comment on the appropriate choice of a signicance level for this problem, as well as the appropriate choice of the null hypothesis