His experiment tested his theory that contact produced a stronger bond between a mother and infant that food. This is known as the attachment theory, which is described as, “specific behaviors in children, such as seeking proximity with the attachment figure when upset or threatened” (McLeod, 2009). At the same time as Harlow completing his studies, the United States makes Hawaii and Alaska states, Castro takes over US property, and Kennedy is elected president. Also during this time in the early 1960s, the beginning of the Civil Rights Movement is going on in the South (Taylor, …show more content…
Stevens published “On the Theory of Scales of Measurement”. This described the characteristics and applications of four types or levels of data. According to Hall (2005), those four types of data are nominal, ordinal, interval and ratio. Nominal level is to differ items based on their name and ordinal allows for a ranking order. Where interval level is measured along a scale where each position is equal distance from each other, such as temperature. Ratio data are number that can be compared as multiple of one another, such as mass or weight. These levels are taught to undergraduates today in courses in psychological statistics. While Stevens published his “Theory of Scales of Measurement”, WWII was just ending and the United States was becoming a major superpower in the world as well as the beginning of the Cold War (Taylor,