A manufacturer wants to Increase the shelf life of a line of cake mixes. Past records indicate that the average shelf life of the mix is 218 days. After a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives in days 217,220, 220, 221, 218, 222, 223, 224, and 221 Using a -0.025, has the shelf life of the cake mix Increased? Multiple Choice Yes, because computed tis greater than the critical value Yes, because computed tis less than the critical value. No, because computed flies in the region of comptance. No, because 220.67 is quite close to 218