# Unit 5: inference and explanation stage

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1. In the Description stage, what is the dif between using a population vs using a sample?
• Population:
• -accurate
• -usually too expensive
• -usually takes too long
• -usually bigger than needed

• sample:
• -usually contains error
• -can be affordable
• -can take little time
• -can be just the right size
2. What are the 3 steps of the Central limit theory?
1- theoretically, a large sample of any descriptive statistic will be normally distributed.

2- theoretically, the mean of this distribution is the population descriptive statistic

3- if a sample descriptive statistic is close to the mean of this theoretical distribution, there is a good chance it is the population descriptive statistic.
3. What is statistical significance?
The amount of risk a researcher takes when deciding to accept or reject the null hypothesis

OR

The probability that a researcher will reject the null hypothesis when it is actually true.

• significance level: p< .05
• p = probabilitiy
 Author: xiongashely ID: 252935 Card Set: Unit 5: inference and explanation stage Updated: 2013-12-13 04:33:05 Tags: fsos Folders: Description: inference Show Answers: