Suppose the correlation between two variables x and y is due to the fact that both are responding to changes in some unobserved third variable. what is this due to?

This is due to the lurking variable. This is a kind of unnecessary variable. They are neither of the variables under study, but some additional random variables that effects one or both. This is because they go unobserved by lurking underneath the surface of the variables of interest, making the connection between them appear stronger or weaker than it really is.

you divide the cost ($15) by the quantity (6) to get your questions answer. the yo-yo costs $2.50. hope this : )!

step-by-step explanation:

answer: the 4 kilogram bag

step-by-step explanation: this is because if you divide the number of kilograms into the total it will tell you how much each individual kilogram would be worth. 2 kilos is 7 and change 3 would be around 6 ish and the 4 kilo would be 4.6 and change and the 5 kilos would be like 4.88