02/10/14 Experimental Research
- Experimental Research- Explores cause and effect relationship.
- Experimentation- Experimentation is all about manipulating and controlling variables.
- Experimental Method
- Blind Study- Subjects are unaware if assigned to experimental or control group.
- Double- Blind Study- Neither subjects nor experimenters know which group is control or experimental.
- Descriptive Statistics- Describe the results of a research.
- Example: 400 likely voters surveyed by phone on Oct. 20. Of these, 230 said they will vote for Obama.
- Inferential Statistics- Are used to make an inference or draw a conclusion beyond the raw data.
- Measures of Central Tendency
- Central Tendency- Where does the center of the data tend to be?
- Mode- The most frequently occurring score in a distribution.
- Mean- The arithmetic average of scores.
- Median- The middle score in a rank ordered distribution.
- Measures of Variation
- Range- The difference between the highest and lowest scores in a distribution.
- Standard Deviation- A computed measure of how much scores vary around the mean.
I liked that you provided an example for descriptive statistic, it helped me more. I will probably repost that example on my blog. but anyway, inferential statistic is actually what most of us hear about because it is based on the descriptive stat. What I mean is, if after the collected that survey as to how many people said they would vote for Obama, the inferential statistic could be that Obama could win that state or district or whatever.
ReplyDeleteI agree with Chisom, I love how you provided an example of descriptive statistics. But the only thing that I wish you would have added an example to is standard deviation. I'm not really sure how standard deviation works, is there an example that you could provide me with?
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ReplyDeleteI came here to ask just what Chisom posted. If there were two things need a bit more added, it's inferential statistics and double-blind study. I get the premise of both, and as Chisom has explained inferential, I understand that as well; could you give an example of a double-blind study?
ReplyDeleteOverall, great job for this section. Everything was very concise, and sometimes that''s just what someone needs.
Double blind experiments, Cody, don't mean that the experimenters don't know an experiment is going on, but that they don't know which subject is in which group. They can still collect data, it just reduces bias on their part. Like measuring the number of astro fans and cardinals fans at a game in Minute Maid park, but everybody's wearing green.
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