A group of 40 subjects was divided into two groups with one group given an energy drink and one group given water. The subjects were then given a spelling test and the mean number of words correctly spelled was recorded for each member of the two groups. This experiment was designed this way to quantify which of the following types of variability?

70 points ! pls 2. given the following two sets of data what is the union of the two sets and what is the intersection of the two sets. set a = {1, 2, 3, 4, 5, 6, 7, 8, 9} set b = {2, 4, 6, 8, 10, 12, 14} 3. given a regular deck of cards. describe a way of pulling cards that would create a dependent event and then one that would create an independent event. 4. what is the probability of drawing a red card and then drawing a spade without replacing the card that was drawn first?