ln a in certain factory, there sample of 250 items produced are two independent from processes manufacturing the same item. "The is found to 120 gms with standard deviation average weight gms, a while the corresponding figures in one process be of 400 items from the other a of 12 gms. Obtain of a sample between sample means. Is process are 124 gm.s and 14 the standard Also find the confidence error difference the interval for in average two the difference significant? 99% difference weights of the items produced by the two processes respectively