Background We will also consider a quantity which is intermediate between Sn and Mn. Zm is defined as follows. 1. subtract nu from S,to obtain the zero-mean random variable Sm-nu 2.then divide by ovn,to form the random variable In= Sn -nu σVmBackground ◼ We will also consider a quantity which is intermediate between 𝑆𝑛 and 𝑀𝑛. ◼ 𝑍𝑛 is defined as follows. 1. subtract 𝑛𝜇 from 𝑆𝑛, to obtain the zero-mean random variable 𝑆𝑛 − 𝑛𝜇 2. then divide by 𝜎 𝑛, to form the random variable 𝑍𝑛 = 𝑆𝑛 − 𝑛𝜇 𝜎 𝑛