More cereal In Exercise 47 we poured a large and a small bowl of cereal from a box. Suppose the amount of cereal that the manufacturer puts in the boxes is a random variable with mean 16.2 ounces and standard deviation 0.1 ounces. a) Find the expected amount of cereal left in the box. b) Whats the standard deviation? c) If the weight of the remaining cereal can be described by a Normal model, whats the probability that the box still contains more than 13 ounces?

Elementary Statistics Notes Amanda Selly August 25, 2016 Observational Study: the study is conducted simply by observing what is occurring naturally. A researcher will watch what's going on in the world, collect data and make conclusions based on them without manipulating or interfering with the situation. Experimental Study: The researches want to know something specific, like the effect of a certain drug or how their product impacts peoples lives. They decide on the variable they want to test and make sure everything else is constant and see how their manipulation effects the outcome. Cluster Sampling: In cluster sampling we divide the entire population into smaller groups and use a few of these groups as our sample. This happens when we are unsure of the pro