# QUMT-

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1. Discrete Random Variable
the set of all possible values is at most a finite or a countably infinite number of possible values
2. Countinuous Random Variable
takes on values at every point over a given interval
3. Required for a discrete probability function
probabilities are between 0 and 1: total of all probabilities equals 1
4. Binomial Distribution
exactly two possible outcomes: success and failure
5. POisson Distribution
describes a process that extends over time space, on any well defined unit of inspection
6. uniform distribution
• uniformly distributed
• anything outside the box = 0
7. Normal distribution
• exhibits the following characteristics: it is continuous distribution, symmetric about the mean, asymptotic
• to the horizontal axis, unimodal, is a family of curves, area under the curve is 1, it is bell shaped.

sample size greater than 30
8. Central Limit theorem
• assumption of normality
• sample distribution will be normal regardless of true population distribution
9. Sampling Reasons
highly precise, less costly, and less time consuming
10. sampling error
• sample mean - population mean
• the greater the sample size the less probability for error
11. Point estimate
the single value of a statistic calculated from a sample which is used to estimate a population parameter
12. interval estimate
a range of values calculated from a sample statistic(s) and standardized statistics, such as the Z
13. Sampling techniques
nonstatistical sampling: convenience, judgement

statistical sampling: simple random, systematic, stratified, cluster
14. statistical sampling
• items of the sample are chosen based on known or calculated probabilities
• simple random
• stratified
• Systematic
• Cluster
15. simple random sampling
equal chance of being selected
16. stratified random sampling
divide population into subgroups (strata) according to some common characteristics
17. cluster sampling
divide population into several clusters, simple random sample of clusters
 Author: mlu.reyes ID: 13252 Card Set: QUMT- Updated: 2010-04-06 06:57:56 Tags: stats Folders: Description: EXAM 2 Show Answers: